Who married Martha, Viscountess of Marsan?

Martha of Marsan (1228–1283) (also known as Mathe or Amata) was a ruling Viscountess of Marsan. She was suo jure Viscountess of Marsan, which she inherited from her father, in 1251-1270.

Gaston VII de Montcada (Latin: Guasto de Biarde; 1225 – 26 April 1290), called Froissard, was the twentieth Viscount of Béarn from 1229. He was the son and heir of Guillermo II de Montcada of the House of Montcada and of Garsenda, daughter of Alfonso II of Provence and Garsenda of Forcalquier. He was succeeded by Roger-Bernard III of Foix.