Henry III, Count of Sayn

– 1246) was the count of Sayn (1202–1246), a county located near the Sieg River in northern Rhineland-Palatinate, Germany.

Gottfried II (Count of Sponheim) had been a regent from 1181 and continued until his death in 1220.

Henry pleaded his case successfully to an assembly of bishops in Mainz and was acquitted.

[1] Conrad, however, refused to accept the verdict, but eventually left Mainz.

While passing near Marburg, Conrad was ambushed and killed by a group of knights.