St. Charles Lwanga died with a group of courtiers and servants in the court of King Mwanga of Uganda (r. 1884-1901). There Feast Day is June 3, and they were canonized in 1964.
Some of the Martyrs were young boys and were slain with horrible cruelty. All were convert of the White Fathers the Missionaries of Africa founded by Charles Cardinal Lavigerie in 1868.
A shrine was erected in their honor, it is now a Basilica.