Although some of Charles' children made claims to the throne, most notably his first son James Scott, 1st Duke of Monmouth, their illegitimacy meant that after Charles' death, his brother James, Duke of York became king instead. Over the years several of Charles' senior descendants have made names for themselves, including Augustus FitzRoy, 3rd Duke of Grafton who became Prime Minister of Great Britain, cricket pioneer Charles Lennox, 1st Duke of Richmond, parliamentary reformer Charles Lennox, 3rd Duke of Richmond.