Petyr Baelish
Robert Arryn, sometimes called 'Sweetrobin', is the only child of Jon Arryn and Lysa Tully. He suffers from frequent seizure-like episodes called a 'shaking illness', and is depicted as intellectually and physically stunted. At the start of the series, he is Lord of the Eyrie and Defender of the Vale though his mother rules as regent. After Lysa's marriage to Petyr Baelish and her subsequent death in "A Storm of Swords", Baelish claims the rule of the Vale and guardianship of Robert. In the absence of his mother, he becomes attached to his cousin Sansa Stark in her disguise of Alayne Stone.