Lucas Harroway

Lord Lucas Harroway was the Lord of Harrenhal and Hand of the King during the reign of his son-by-law, Maegor Targaryen.

History
Lucas became Maegor Targaryen's father-by-law when the prince married his daughter, Alys Harroway. At some point, he was named Hand of the King to Maegor. In 44 AC, Alys had a deformed stillborn baby. Because of this, King Maegor executed her and Lucas, then marched on Harrenhal and wiped out everyone with a drop of Harroway blood.

In the books
In The World of Ice & Fire and Fire & Blood, Lucas Harroway's story is the same.