House of Grimaldi series. Left stamps featuring Rainier III, Prince of Monaco (Rainier Louis Henri Maxence Bertrand Grimaldi, Count of Polignac; 31 May 1923 – 6 April 2005), styled His Serene Highness The Sovereign Prince of Monaco, ruled the Principality of Monaco for more than 50 years, making him one of the longest ruling monarchs of the 20th century.
Cover from Monaco. Stamp on the right above featuring Albert II, Sovereign Prince of Monaco, the current ruler of the Monaco. On the left above featuring Albert I, Prince of Monaco (13 November 1848 – 26 June 1922) was the tenth reigning Prince of Monaco and the tenth Duke of Valentinois from 10 September 1889 until his death. Thank you, Mr. Maleret.