Ferrante of Portugal was born in 1188, one of the sons of Sancho I Portugal and Dulce Raimundez of Barcelona. He married Jeanne of Flanders and passed away in 1233[1].
While on their way to Flanders, Ferdinand and Joan were captured by Joan's first cousin Louis, eldest son of Philip II of France and Joan's aunt Isabella. Louis' aim was to acquire his dead mother's dowry, a large piece of Flemish territory including Artois, which Joan's father had taken back by force after Isabella's death.
Released after this concession, Joan and Ferdinand soon joined the old allies of her father, King John of England and Emperor Otto IV, in an alliance against France. They were decisively defeated at Bouvines in July 1214, where Ferdinand was taken prisoner.
The Routledge Companion to Medieval Warfare By Jim Bradbury P.33 https://books.google.com/books?id=3FRsBgAAQBAJ&pg=PA33&dq=fernando+of+portugal+count+of+flanders&hl=en&sa=X&ved=0ahUKEwiB_7Kgt8LnAhWIFjQIHWbhB-gQ6AEIPTAD#v=onepage&q=fernando%20of%20portugal%20count%20of%20flanders&f=false
https://www.britannica.com/event/Battle-of-Bouvines-1214#ref1243826
https://en.m.wikipedia.org/wiki/Ferdinand,_Count_of_Flanders
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