Uther Pendragon

Uther Pendragon was the king of Britain and father of Artoria Pendragon, Morgan le Fay, elder brother of Vortigern and husband of Lady Igraine.
When his younger brother Vortigern invited the Saxons into England, Uther Pendragon was vanquished in a fight against Vortigern and Britain entered the Dark Ages.

Fearing the British Isle’s demise of supernatural blessings, Uther Pendragon wed Lady Igraine and came up with the idea to create an heir to save Britain. Lady Igraine’s blood was the most suitable to combine Uther’s blood with the blood of the Red Dragon, and combining the three Arthur Pendragon, a hybrid between dragon and human, was born.

In Fate/Grand Order- Avalon le Fae:

Uther is a Human of the British Lostbelt who lived during the Fairy Calendar.
Uther was the king who united human and fairies by marrying Mab and uniting their kingdoms. He was killed at his coronation in Londinium and died in Aesc's arms.