Luthor Tyrell

Luthor Tyrell, is an unseen character in Game of Thrones. He is deceased when the events of the series begin and is not expected to appear in the series.

Luthor Tyrell is the father of Mace Tyrell, the Lord of Highgarden and the head of House Tyrell. He is survived by his widow Olenna Tyrell, known as the "Queen of Thorns".

In the books
In the Song of Ice and Fire novels, his family remains the same. He died by riding over a cliff while hawking.