He had broad shoulders. Jon Arryn was married three times, first to Jeyne Royce, and then to Rowena Arryn, a cousin. Neither marriage produced a child. Because he had no children, he had appointed a number of heirs who died one after another. First his nephew Elbert Arryn, the son of his younger brother Ronnel. After Elbert was executed by Aerys II, Denys Arryn became heir. He was of a lower branch of House Arryn from Gulltown and had married Jon’s niece. He was killed in the Battle of the Bells.
During the Rebellion, Jon had married a third time to Lysa Tully, the daughter of Hoster Tully. Their marriage was loveless. Lysa found Jon to be too old and hated his bad breath. After several miscarriages Lysa gave Jon a sickly son and heir, Robert Arryn.