Walls of Constantinople
The health of Theophilos gradually failed, and he died on 20 January 842. His reputation as a judge endured, and in the literary composition "Timarion" Theophilos is featured as one of the judges in the Netherworld. Theophilos strengthened the Walls of Constantinople, built the fortress of Sarkel on the Don river in Khazar territories, created the Cherson, Paphlagonia and Chaldia themes, and built a hospital, which continued to exist until the twilight of the Byzantine Empire.