Teófilo Yldefonso

His daughter, Norma, competed at the 2nd Asian Games held in Manila, Philippines and won a silver medal in the 100m butterfly event.

Yldefonso was named as part of the Hall of Fame by the International Swimming Federation in 2009. His unorthodox style of swimming would later become known as the "Yldefonso Stroke". It has been adapted by pint-sized swimmers, especially those from Asia, particularly the Japanese.

In 2006, the municipal government of Piddig unveiled a monument in Yldefonso's honor for his feats in swimming and World War II.

He collected a total of 144 medals in his career which lasted until 1937. He won two bronze medals in the 200 m breaststroke event, at the 1928 and 1932 Summer Olympics, and placed 7th in the 1936 edition.

Yldefonso was married to Manuela Ella in 1925 with whom he had six children: Porfirio, Emilio, Felipe, Norma, Herminia, and Carmelito.

Yldefonso began joining regional swimming meets in the 1923. Competing in the 200-meter breaststroke, he won multiple gold medals in the Far Eastern Games (1923, 1927, 1930, and 1934). He also stood out in the Philippine vs. Formosa Dual Meets (1929, 1931, 1933, and 1937).

Yldefonso joined 57th Infantry Regiment of the Philippine Scouts of the United States Army in 1922 upon turning 18 years old. It was with the military he was exposed to competitive swimming.

Teófilo E. Yldefonso (born Teófilo Yldefonso y de la Cruz; November 5, 1903 – June 19, 1942) was a Filipino breaststroke swimmer. He was the first Filipino and Southeast Asian to win an Olympic medal, and the first Filipino to win multiple medals.

Teofilo Yldefonso was born on November 5, 1903 in Sitio Bayog, Piddig, Ilocos Norte to Felipe and Aniceta Yldefonso. He was the second among three siblings. His mother died after giving birth to his younger brother, who died at a young age. The Yldefonso siblings taught themselves to swim at the Guisit River.