Viserys II Targaryen, is an unseen character in Game of Thrones. He is not expected to appear in the series, being long dead by the time it begins.
Viserys II was the second King of his name to sit on the Iron Throne and the tenth king of the Targaryen dynasty to rule the Seven Kingdoms. He was an ancestor of Viserys and Daenerys Targaryen. He was formally styled Viserys of House Targaryen, the Second of His Name, King of the Andals and the First Men, Lord of the Seven Kingdoms and Protector of the Realm.
In the A Song of Ice and Fire novels, Viserys II was the second son of Rhaenyra Targaryen and the younger brother of King Aegon III, the Dragonbane. He served as Hand of the King to both his nephews, Daeron I, the Young Dragon, and Baelor I, the Blessed, helping keep the realm intact first while Daeron warred and then as Baelor prayed. It was rumored that he had the stonemason Baelor had appointed as High Septon poisoned. It was also rumored that he poisoned Baelor, which is the reason he's not remembered fondly. He officially reigned only for a year, but he truly ruled and preserved the land for much longer as Hand of the King, keeping the realm together while Daeron obsessed with fruitless conquests and Baelor obsessed with prayer.
According to a semi-canon source, Viserys II was clean-shaven with long hair. He had a prominent nose, bushy eyebrows and a shrewd, calculating look to him. He wore the simple crown of Aegon III.