Version 4 of a map of trade, communication and strategic routes over the 200 year period from 1000 to 1200 AD by Martin Jan Månsson is found here Map of 11th to 12 century trade routes by Martin Jan Mansson, 19 May 2018 (Version 4). He is a graduate student in Spatial Planning at the Blekinge Institute of Technology, Sweden. Månsson cites 20 sources in the map's ledger. Månsson's 19 May 2018 post is here
There much to consider. Here's a detail. Appearing as "notable locations" at about the half way point of the thick purple silk route are Tabriz, Dvin and Ani. That route moves then to Erzerum, where it splits east and south.
Download a high resolution 40MB version of the map here: https://mega.nz/#!0ioSTSbJ!SnwLCRRNQLWq ... Mkni_YLx-0