He married Princess Alix of Hesse, who was the daughter of Princess Alice of the United Kingdom and the granddaughter of Queen Victoria , and they had five children, Olga, Tatiana, Maria, Anastasia, and Alexi. Alexi suffered from a disease called haemophilia, which caused his parents great sadness. After 1905, the royal family became friends with Grigori Rasputin, a priest whom they believed could treat Alexi.