This is Umayya ibn Abi-s-Salt, a Meccan who did not accept Islam and died in 630.
The Medina pieces, whether entire suras or isolated passages interpolated in Meccan suras, are accordingly pretty broadly distinct, as to their contents, from those issued in Mecca.
Meccan suras, interpolated in Medina revelations, arose (e.g.
Be- sides, it is a priori unlikely that a contemporary of Mahomet should have drawn up such a list; and if any one had made the attempt he would have found it almost impossible to obtain reliable information as to the order of the earlier Meccan suras.
Between these two groups stand a number of other Meccan suras, which in every respect mark the transition from the first period to the third.