Hiroki Sajyou

Father of Manaka and Ayaka. Had high expectations of Manaka due to her genius-level of skill at magecraft. He wanted to use the Grail as a bridge to the Root, something his family had failed to attain for a thousand years and yearned for a thousand years more.

He would be killed and sacrificed to the Grail by his daughter Manaka towards the end of the War.

(Source: TYPE-MOON wikia)