April 18, 1865 – Birth of Johanna Loisinger, morganatic wife of Prince Alexander of Battenberg, former Prince of Bulgaria, in Preßburg, Hungary (now Bratislava, Slovakia) Unofficial Royalty: Johanna Loisinger, Countess von Hartenau
April 18, 1917 – Birth of Princess Frederica of Hanover, wife of King Paul I of Greece, in Blankenburg am Harz, Prussia, Germany
Full name: Frederica Louise Thyra Victoria Margaret Sophie Olga Cecily Isabelle Christina
Unofficial Royalty: Frederica of Hanover, Queen of Greece
April 18, 1955 – Wedding (first) of King Hussein I of Jordan and Dina bint Abdul-Hamid
The couple divorced in 1957.
Unofficial Royalty: King Hussein I of Jordan
Unofficial Royalty: Dina bint Abdul-Hamid, Queen of Jordan
April 18, 1969 – Birth of Sayako Kuroda, born Princess Nori of Japan at the Aoyama Detached Palace in Tokyo, Japan
Sayako Kuroda is the daughter of Emperor Akihito of Japan. At the time of her marriage in 2005, she left the Imperial Family and took the surname of her husband as required by Imperial Household Law.
Unofficial Royalty: Sayako Kuroda, formerly Princess Nori of Japan
April 18, 1972 – Birth of Annette Sekrève, wife of Prince Bernhard of Orange-Nassau, in The Hague, The Netherlands
Unofficial Royalty: Princess Annette of Orange-Nassau
April 18, 2007 – Birth of Prince Lerotholi Seeiso of Lesotho, heir and son of King Letsie III of Lesotho, in Maseru, Lesotho
Wikipedia: Prince Lerotholi Seeiso of Lesotho