Lord Baelish (father of Petyr)

"During the War of the Ninepenny Kings, a cheap name for a cheap cause, where other men fought for the king my father fought to befriend Hoster Tully, Lord Paramount of the Trident and head of one of the oldest and greatest houses in Westeros. Thanks to my father's heroic efforts, Lord Hoster agreed to foster me at Riverrun with his own children."

- Petyr Baelish

Baelish is an unseen character in Game of Thrones. He is deceased when the events of the series begin. He is not expected to appear in the series. He is the father of major character Petyr Baelish.

Biography
During the War of the Ninepenny Kings, he fought for the favor of Lord Hoster Tully, Lord of Riverrun and Lord Paramount of the Trident. He won his friendship and Lord Hoster agreed to foster Baelish's son Petyr at Riverrun alongside his own children Catelyn, Lysa and Edmure.

In the books
In the A Song of Ice and Fire novels, his story is the same.