Soon after 846, with the end of the thirty-year-truce, Malamir (or Presian) invaded the regions of the Struma and the Nestos, and Empress-Regent Theodora (r. 842–855, the wife of Theophilos) answered by attacking Thracian Bulgaria. A brief peace was concluded, then Malamir proceeded to invade Macedonia. The Bulgars also imposed rule on the Morava region, the frontier region between Serbia and the Bulgarian Khanate; in 844, an anonymous Bavarian geographer mentions the "Merehani" as the people that bordered the Franks furthest away. They lived in the valleys of the present-day Morava river basin, and were still unconquered by the Bulgarians. However, after 845, the Bulgars added these Slavs to their "societas"; they are last mentioned in 853.