Two weeks after his "run" at Hurst Park, Alycidon recorded his first victory in the one mile Classic Trial Stakes at Thirsk Racecourse in which he was ridden by a stable lad named Shaw.

He finished third to Vic Day, being apparently unsuited by the tactics employed by his jockey T. Lowrey, who restrained the colt before attempting to produce him with a late burst of speed.

Later in July he won the St George Stakes at Liverpool over thirteen furlongs, partnered for the first time by Doug Smith who rode him in all his remaining race.

[6] In the St Leger Stakes on 11 September, Alycidon started at odds of 20/1 in a field of fourteen runners in front of a crowd estimated at 500,000 which included the King and Queen.

[7] Smith attempted to make all the running on Alycidon, but was caught inside the final quarter mile and beaten one and a half lengths by the American-bred Black Tarquin.

On his final race of the year he was sent to Ascot for the two-mile King George VI Stakes, an important international event which attracted three French challengers.

Alycidon tracked his pacemaker Benny Lynch, before taking the lead half a mile from the finish and drawing clear to win by five lengths.

In the straight, Black Tarquin moved up to challenge and drew level a furlong from the finish, but Alycidon pulled away again in the closing stages to win by five lengths.

[12] By winning the Ascot, Goodwood and Doncaster Cups he completed the Stayers' Triple Crown, a feat that had not been achieved by any horse since Isonomy in 1879[13] and was not repeated until Le Moss won all three races in 1980.

He sired 19 stakeswinners for 34 stakeswins including the fine stayer Grey of Falloden (9 wins and £25,098) and other high-class fillies such as The Oaks winners Homeward Bound (£42,243) and Meld (British Fillies Triple Crown); Almeria plus these horses: After a successful early stud career, Alycidon began to suffer from low fertility and by 1962 he was getting fewer than one in three of his mares in foal.