April 21: Natale di Roma in Italy (AD 47); Patriots' Day in some parts of the United States (2025) Wignacourt Aqueduct 900 – A debt was pardoned by the chief of Tondo on the island of Luzon and recorded on the Laguna Copperplate Inscription, the earliest known calendar-dated document found in the Philippines. 1615 – The Wignacourt Aqueduct (pictured) in Malta was inaugurated, and was used to carry water to Valletta for about 300 years. 1725 – J. S. Bach's cantata Bleib bei uns, denn es will Abend werden, was first performed on Easter Monday. 1925 or 1926 – Al-Baqi Cemetery in Medina, the site of the mausoleum of four of the Twelve Imams of Shia Islam, was demolished by Wahhabis. 1975 – South Vietnamese president Nguyễn Văn Thiệu resigned on hearing of the fall of Xuân Lộc, the last battle of the Vietnam War. Pope Alexander II (d. 1073)Antonín Kammel (b. 1730)Cheryl Gillan (b. 1952)Vivian Maier (d. 2009) More anniversaries: April 20 April 21 April 22 Archive By email List of days of the year About