I always felt a special connection to Elizabeth of Hungary. In catholic school we had to do a report on a saint when I was in grade 6 (my family didn't go to church when Iwas a kid though I was baptized, ended up in catholic school in grade 5 when we moved and no suitable public school was close). I found her fascinating.
Saint Elizabeth of Portugal was her great-niece and was named for her. Elizabeth of Hungary's half sister Yolanda was Elizabeth of Portugal's paternal grandmother. She was known as the peacemaker. During her husband Dennis' life she helped negotiate peace between him and Sancho of Castile, and later between Sancho's son Fernando and her brother James II of Aragon. After her husband's death she retreated to a convent but was called out once again to stop her son Alfonso IV from going to war with his son in law, Fernando's son Alfonso XI of Castile. Her son had married her granddaughter Maria to Alfonso of Castile but he was cold and abusive, and her son intended war. Elizabeth negotiated peace but she was left weak and died soon after.