Philippine Declaration of Independence
Following the end of World War II, the United States granted independence to the Philippines on 4 July 1946 via the Treaty of Manila. July 4 was observed in the Philippines as "Independence Day" until August 4, 1964 when, upon the advice of historians and the urging of nationalists, President Diosdado Macapagal signed into law Republic Act No. 4166 designating June 12 as the country's "Independence Day". June 12 had previously been observed as "Flag Day" and many government buildings are urged to display the Philippine Flag in their offices.
Gabriel Fabella
Gabriel Fabrero Fabella (March 18, 1898 – January 29, 1982) was a prominent Filipino historian during the 20th century. He is primarily known as the historian behind Philippine President Diosdado Macapagal's decision to issue Proclamation No. 28 on May 12, 1962, which changed the date of Philippine independence from July 4, 1946 to June 12, 1898 — the date when Philippine President Emilio Aguinaldo proclaimed the country's independence from Spain in Kawit, Cavite. For this achievement, Fabella became known as the "Father of June 12 Independence Day."