Background
Yolanda was the daughter of Baldwin V, Count of Hainault, and Countess Margaret I of Flanders.
Yolanda was the daughter of Baldwin V, Count of Hainault, and Countess Margaret I of Flanders.
After the death of the latter in 1216 there was a brief period without an emperor, before Peter was elected. Peter sent Yolanda to Constantinople while he fought the Despotate of Epirus, during which he was captured. Because his fate was unknown (although he was probably killed), Yolanda ruled as regent.
However, she soon died, in 1219.