[tradition] makes the Aila power begin at Allahabad and yet distinctly suggests that they came from outside India. - Frederick Eden Pargiter

One branch, headed by Uśīnara established several kingdoms on the eastern border of the Punjab [...] his famous son Śivi originated the Śivis [footnote: called Śivas in Rigveda VII.18.7] in Śivapura, and extending his conquests westwards [...] occupying the whole of the Punjab except the northwestern corner.

There is nothing in them (Puranic accounts), as far as I am aware, really inconsistent with the most ancient book we possess, namely, the Rigveda, and they throw much light thereon, and on all problems concerning ancient India.

The Aryans began at Allahabad, conquered and spread out northwest, west and south, and had by YayAti’s time occupied precisely the region known as MadhyadeSa… They expanded afterwards into the Punjab and East Afghanistan, into West India and the northwest Dekhan…