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John of Brienne

John of Brienne (c. 1170–1237), a younger son of the count of Brienne, married the heiress Maria and was crowned king of Jerusalem in 1210. After Maria's death he ruled as regent for their daughter Isabella and led the Fifth Crusade, which seized Damietta in 1219 before its collapse in 1221.

In 1225 he married Isabella to Emperor Frederick II, who took the kingdom from him. Elected Latin emperor in 1229 and crowned in 1231, he led the defense against Nicaea and Bulgaria in 1235–1236 and died as a Franciscan friar in 1237.

References

  1. en.wikipedia.org/wiki/John_of_Brienne
  2. zh.wikipedia.org/wiki/布列訥的約翰