Question: What is the date of death of Beatrice Of Swabia's husband?
Sentence (from "Otto IV, Holy Roman Emperor"): Otto IV (1175 – 19 May 1218) was one of two rival kings of Germany from 1198 on, sole king from 1208 on, and Holy Roman Emperor from 1209 until he was forced to abdicate in 1215.
Relevant evidence: Yes