Regarding ancient old R1a in Serb populated areas in Balkan, there are two possibilities:
1) ancient old pocket comes from stream-like spread that was stretching from south Siberia (22000 years old R1a) and was broken in two parts leaving two pockets: Balkan and south Siberia...
2) ancient old R1a pocket completely moved from some other place to Balkan in more recent times
as there is no ancient old R1a along the way from Siberia to Balkan, one could as Klyosov conclude it is case 1, but I would be more cautious there...
I think it may also be the case that it arrived with Serbs...
reason I say this is that Seneca speaks of Serians
[369] Though kings should gather themselves together, both they who vex the scattered Scythians and they who dwell upon the Red Sea’s marge, who hold wide sway o’er the blood-red main with its gleaming pearls, they who leave unguarded26 the Caspian heights to the bold Sarmatians; though he strive against him, who dares on foot to tread the Danube’s waves27 and (whersoe’er they dwell,) the Serians28 for fleeces famous – ‘tis the upright mind that holds true sovereignty. He has no need of horses, none of arms and the coward weapons which the Parthian hurls from far when he feigns flight, no need of engines hurling rocks, stationed to batter cities to the ground. A king is he who has no fear; a king is he who shall naught desire. Such kingdom on himself each man bestows.
Seneca - Thyestes
27. i.e. the frozen surface.
28. The poet here conceives of the Serians as near by Scythia.
http://www.theoi.com/Text/SenecaThyestes.html
Now these Serians (also named Seres by some authors) are a tribe that lives both around Danube and in what is now north west China north of Himalayas, but this location can be seen as south Siberia or very close to it. This makes Serians good candidate for ancient old R1a pockets... I argue that besides ancient old R1a, they also carried haplogroup I...
Seres (Gr. Σῆρες, Lat. Sērēs) was the ancient Greek and Roman name for the inhabitants of eastern Central Asia, but could also extend to a number of other Asian people in a wide arc from China to India.[1] It meant "of silk," or people of the "land where silk comes from." The country of the Seres was Serica.
http://en.wikipedia.org/wiki/Seres
the arc of Serians from India to China is likely reflected today in Pashtun
Sarbans... who by looking at their spread and spread of haplogroup I in Asia, besides R1a also carry some I haplogroup that makes them stand out from non-I haplogroup environment...
look at arc of Serians from China to India clearly visible in spread of haplogroup I..it really is arc...
now look carefully how Pasthun Sarbans match big part of this arc pretty well in Afghanistan and Pakistan
Seres/Serians are known for silk production and are by Pliny the Elder written as
Serve
that beyond the Emodian Mountains they look towards17 the Serve, whose acquaintance they had also made in the pursuits of commerce;
http://www.perseus.tufts.edu/hopper/text?doc=Plin.+Nat.+6.24&redirect=true
*Emodian mountains are Himalayas..and north of them are Seres who trade silk...
Seneca mentions their braveness to cross frozen Danube, to live unguarded from Sarmatians in Caspian mountains, and also the ones who control the Red sea
now, the ones in Caspian highlands may be Serboi tribe
http://en.wikipedia.org/wiki/Sarmatians
interestingly, Serboi/Serbi lived there north of Caucasian Albania same like on Balkan Serbia is north of Albania... coincidence?
the Serians who control the Red sea I can only relate to Sabaeans/Sheba but I have no genetic indication that this is correct...they would be remainder of Sherdana sea peoples which left single toponym - Serbonian bog (it was lake in Egypt)
http://en.wikipedia.org/wiki/Sabaeans
http://en.wikipedia.org/wiki/Sheba
The name of the Serbonian Bog (Arabic: مستنقع سربون) applied to the lake of Serbonis (Sirbonis or Serbon) in Egypt relates to the Sea Peoples. When sand blew onto it, the Serbonian Bog appeared to be solid land, but was in fact a bog. The term is now applied metaphorically to any situation in which one is entangled from which extrication is difficult.
http://en.wikipedia.org/wiki/Sea_peoples
but note that Seres also dwell upon mount Athos in time of Aristotle...
Howbeit, Aristotle writeth, That these Pygmæans live in hollow caves & holes under the ground. For all other matters he reporteth the same that all the rest. Isogonus saith, that certaine Indians named Cyrni, live a hundred and fortie yeeres. The like he thinketh of the Æthhyopian Macrobij, and the Seres: as also of them that dwel upon the mount Athos: and of these last rehearsed, the reason verily is rendered to be thus, because they feed of vipers flesh, and therfore is it that neither lice breed in their heads, nor any other vermine in their cloths, for to hurt and annoy their bodies.
http://penelope.uchicago.edu/holland/pliny7.html
Now in time of Aristotle, we have Serians/Seres living upon (north of?) mount Athos..
location of Serians both around Danube, north of mount Athos, and in south Siberia suggests that ancient old pocket of R1a is related to Serians and relation of Serians to tribal names such as Serve/Sarbans/Serboi tells us that they are likely to be proto-Serbs... note that this is not only about ancient old R1a pocket moving around as haplogroup I also shows correlation with spread of Serians...
if we look for similar tribal names to Serians north of mount Athos they could have been known as Scordisci and Serdi...in my opinion Serdi and Scordisci is about same people but Celtic and Thracian version of tribal name because Serdi originally Celtic people enter Thrace from area of Celtic Scordisci and become thracanized...
http://en.wikipedia.org/wiki/Serdi
expansion of Celtic Serdi perhaps also is the reason for I2a2 spread along west coasts of Asia minor (though this can as well be earlier spread)
now regarding Scordisci and Serdi being two versions of same tribal name (because Celtic Serdi came to Thrace from area of Celtic Scordisci) Scordisci can be read Sordisci (same as Sclaveni are in fact Slaveni) and -isci ending is due to them being Celtic...which igives same "srd" root in trobal names Scordisci and Serdi
similarly Thracians are same tribal name as Rascians (see medieval Serbia
http://en.wikipedia.org/wiki/Rascia)/Russians/Rasena (tyrhsenian /Etruscan)
In Attic Greek the Etruscans were known as Τυρρήνιοι (Tyrrhēnioi), earlier Tyrsenoi, from which the Romans derived the names Tyrrhēni (Etruscans), Tyrrhēnia (Etruria), and Mare Tyrrhēnum (Tyrrhenian Sea).[2] The Etruscans called themselves Rasenna, which was syncopated to Rasna or Raśna.[3]
http://en.wikipedia.org/wiki/Etruscan_civilization
Etruscan areas show clear correlation with R1a spread in Italy
Thracian tribal name is about R1a people...
Scordisci might be Serians and mix of R1a and I haplogroup...
back to Serboi living north of Caucasian Albania,
Scordisci live north of Illyrians and are according to Strabo mixed with Illyrians and their allies...
I shall first describe Illyria, which approaches close to the Danube, and to the Alps which lie between Italy and Germany, taking their commencement from the lake in the territory of the Vindelici, Rhæti, and Helvetii.7 [2]
The Daci depopulated a part of this country in their wars with the Boii and Taurisci, Keltic tribes whose chief was Critasirus. The Daci claimed the country, although it was separated from them by the river Parisus,8 which flows from the mountains to the Danube, near the Galatæ Scordisci, a people who lived intermixed with the Illyrian and the Thracian tribes. The Illyrians were destroyed by the Daci, while the Scordisci were frequently their allies.
The rest of the country as far as Segestica,9 and the Danube, towards the north and east, is occupied by Pannonii, but they extend farther in an opposite direction.
http://www.perseus.tufts.edu/hopper/text?doc=Perseus:text:1999.01.0239:book=7:chapter=5&highlight=
Strabo (63/64 BC – ca. AD 24) - Geographica
now this may explain why haplogroup E is so large in numbers in Serbs (also in Bosnian Serbs)...
Illyrian component would be E-V13, tribal name may origin from Serians which makes them mix of R1a and I*, and classifying them as Galatae would be about dominant I2 (some authors relate original Celts/Galatae to Germanic people (haplogroup I) with word German meaning original, some relate it to Gomer people who match I2a2 island in asia minor and its spread north of Black sea... also there are indicators that Veneti were I2a as well and that among Celts prominent tribe were Celtic Veneti from Britanny...see more about original Gomer/Cimmerians at
http://www.eupedia.com/forum/showthread.php?p=363659#post363659 and of original Celts issue on
http://www.eupedia.com/forum/showthread.php?p=363658#post363658 )
now, in Celtic areas of prehistoric Iberia we find Kaladuni (ancestors of Scotish people also known as Albanah in Gaelic) next to Seurbi, and in Illyria we find Chelidoni close to Serdi...we saw that Scordisci lived mixed with Illyrians...so Celtic Iberia would be map of Balkan mix...coincidence?
http://www.eupedia.com/forum/showthread.php?p=365929#post365929
well, let's see whether Scordisci can be Seres who dwelt upon mount Athos...
on first view one expect Scordisci in north Serbia around Danube and in Pannonia....
but Serdi and Scordisci did also live much more to the south, e.g. we can find them in south Serbia on this map
The Scordisci (Greek,"Σκορδίσκοι") were an ancient Celtic tribe centered in what would become the Roman Provinces of lower Pannonia, Moesia and present-day Serbia at the confluence of the Savus[1] (Sava), Dravus[2] (Drava) and Danube rivers. . Their tribal name may be connected to the name of the Scordus[3] mountain (Šar mountain) which was located between the regions of Illyria and Paionia.
http://en.wikipedia.org/wiki/Scordisci
Scordisci are the origin of name Sar mountain...Sar mountain is practically going along border of Macedonia and Albania...
If we look again to map above that is showing Illyrian/Hellenic/Thracian tribes and Serdi and Scordisci, It is reasonable to consider that on one side of Sar mountain lived Illyrians and on other Scordisci and perhaps to them related people Paioni (same as Pannoni and Scordisci are spread in Pannonia)...
They were historically notable from the beginning of the third century BC until the turn of the common era. At their zenith, their influence stretched over regions comprising parts of the present-day Austria, Croatia, Hungary, Serbia, Slovenia, Slovakia and Bosnia and Herzegovina
http://en.wikipedia.org/wiki/Scordisci
now, this zone of influence from Macedonia to Bohemia, explains Serbs coming from Bohemia to Balkan in 7th century...
Scordisci are Celtic people related to Boii, Serbs come in 7th century to Balkan from land of Boika (Bohemia named after Boii)
Scordisci might have retracted to north with Roman expansion and came back with weakening of Roman empire.... location of Scordisci is consistent with mention of Serians around Danube as Seneca the younger who mentions Serians around Danube lived (c. 1 BC – AD 65) and in that time frame Scordisci are still located around Danube
Scordisci at 1AD
After the destruction of the tower and the division of the nations, the sons of Shem occupied the eastern regions, and sons of Ham those of the south, and the sons of Japheth the western and the northern lands. Among these seventy-two nations, the Slavic race is derived from the line of Japheth, since they are the Noricians, who are identical with the Slavs.
Over a long period the Slavs settled beside the Danube, where the Hungarian and Bulgarian lands now lie. From among these Slavs, parties scattered throughout the country and were known by appropriate names, according to the places where they settled. Thus some came and settled by the river Morava, and were named Moravians, while others were called Czechs. Among these same Slavs are included the White Croats, the Serbs, and the Carinthians. For when the Vlakhs attacked the Danubian Slavs, settled among them, and did them violence, the latter came and
made their homes by the Vistula, and were then called Lyakhs. Of these same Lyakhs some were called Polyanians, some Lutichians, some Mazovians, and still others Pomorians. Certain Slavs settled also on the Dnipro, and were likewise called Polyanians. Still others were named Derevlians, because they lived in the forests. Some also lived between the Pripet' and the Dvina,
and were known as Dregovichians. Other tribes resided along the Dvina and were called Polotians on account of a small stream called the Polota, which flows into the Dvina. It was from this same stream that they were named Polotians. The Slavs also dwelt about Lake Il'men', and were known there by their characteristic name. They built a city which they called Novgorod.
Still others had their homes along the Desna, the Sem', and the Sula, and were called Severians. Thus the Slavic race was divided, and its language was known as Slavic
http://www.utoronto.ca/elul/English/218/PVL-selections.pdf
(translation of early medieval Russian document from year 1113th that narrates about history of Slavic people...read more on
http://en.wikipedia.org/wiki/Primary_Chronicle)
note that in time it is written Bulgaria and Hungary were neighboring states, which means this is about proto-Slavic people area around Danube from Black sea to Bohemia including parts of Serbia and Romania around Danube... this in antic people matches Thracians, Scordisci (or Serdi), and Pannoni....
note that also I2a2 shows spread along Danube from Black sea to Bohemia, and also spread along Carpathian mountains which is where it was pushed with advance of Roman empire...
Danube
Carpathians
Both Danube and Carpathians are natural borders and obstacles to spread coming from south....
It is very logical that tribes south of Danube would (when systematically attacked from south) cross Danube in order to use Danube as natural border, so Danube was one line of defense from Roman spread and when this line was broken retreat is made to Carpathians and behind Carpathians, that is to Vistula region...