When Richard de Lancaster was born in 1420, in Rainhill, Lancashire, England, his father, Sir John Richard Rainhill de Lancaster, was 20 and his mother, Lady Margaret Bradshawe, was 30. He married Blanch Leigh in 1450, in England, United Kingdom. They were the parents of at least 2 sons and 3 daughters. He died in 1526, in his hometown, at the age of 106.