full name Rainier Louis Henri Maxence Bertrand de Grimaldi. 1923–2005, ruling prince of Monaco (1949–2005). He married (1956) the US actress Grace Kelly (1929–82)
Rainier III in American English
(reiˈnɪər, re-, rə-, French ʀeˈnjei)
noun
Rainier Louis Henri Maxence Bertrand de Grimaldi (lwi ɑ̃ːˈʀi makˈsɑ̃ːs beʀˈtʀɑ̃ː də ɡʀimalˈdi), Prince of Monaco, 1923–2005, reigning prince of Monaco 1949–2005