Beauclerk, fourth son of the 5th Duke of St Albans and a direct descendant of Charles II and Nell Gwynn, was already the dominant amateur batsman in English cricket. He had been playing major matches since 1791 and ran the MCC committee in all but name. The 1805 season produced his finest sustained batting. On 1-3 July he made 129 not out for Hampshire (a side raised in name only — most of his team-mates were MCC men) against an England eleven at Lord's Old Ground in Dorset Square. On a rough pitch where the next-highest score in his innings was barely 30, he batted through to remain undefeated. Six weeks later, in an England v Surrey match at the same ground in August, he made 102 in the first innings, again on a difficult surface. No other batsman had been recorded with two centuries in a single English summer; the previous benchmark for amateur batting had been a single high score per career. Beauclerk's record stood until 1817, when William Lambert scored two centuries in the same match for Sussex against Epsom. By that time Beauclerk was the leading figure in the cricket establishment and his 1805 feat was part of the case for his pre-eminence.