Eleanor married in Valencia on 27 August 1349 to Peter IV of Aragon,[a] on the condition that he renounce all rights to any Sicilian Crown.

Eleanor became a powerful influence at the Aragonese court, replacing Bernardo de Cabrera as Peter's chief adviser.

Then in 1357 Frederick proposed to transfer the duchies of Athens and Neopatria to Eleanor in return for military help from her husband in Sicily, but was refused.

In 1373 Eleanor's eldest son John married Martha of Armagnac, a calm and conciliatory woman.

In Lleida on 20 April 1375,[5] Eleanor died leaving her husband a widower and her three surviving children.