Feast of the Holy Sovereigns

The Feast of the Holy Sovereigns is celebrated annually in the Episcopal Church in Hawaii on November 28. The feast celebrates the founders of the Anglican Church of Hawaiʻi, King Kamehameha IV and Queen Emma of Hawaii.
The rest of the Episcopal Church in the United States of America observes this as the feast day of Kamehameha and Emma, King and Queen of Hawaii, but does not use the name "Feast of the Holy Sovereigns".
Their Collect in begins, "O God, who called your servants Kamehameha and Emma to an earthly throne that they might advance your heavenly kingdom" and includes the lines "grant that we also may be fruitful in good works, and attain to the glorious crown of your saints," referring to their positions on the throne and in crowns.
The feast is also celebrated in the Anglican Church in North America.