Who married Herman I, Count of Henneberg?

Herman I, Count of Henneberg (1224 – 18 December 1290) was the son of Count Poppo VII of Henneberg and his wife, Jutta of Thuringia (born: 1184; died: 6 August 1235 in Schleusingen), the eldest daughter of Landgrave Herman I of Thuringia. This was Poppo's second marriage and also Jutta's second marriage. Margrave Henry III of Meissen was Herman's half-brother from his mother's side. Herman supported the election of his uncle Henry Raspe as anti-king of the Germans.

Herman founded the "new lordship" around Coburg and Eisenburg, which was inherited by the House of Wettin via his grand-niece Catherine of Henneberg.

Margaret of Henneberg (1234 – 26 March 1276) was a Dutch countess, known for a famous medieval legend. She was a daughter of Count Floris IV of Holland and his wife, Matilda of Brabant.