Civil war comes to Constantinople, death comes to Turnovo, and Osman comes to Anatolia.

Below is an image of the grave of Osman in Bursa, Turkey, taken by me in 2013 followed by a map of Osman's territory, a map of the military campaigns of Theodore Svetoslav, and the Balkans in general during this period.

A video covering the Battle of Skafida (turn on captions for English subtitles)