At 6'3", Romero routinely played "Latin lovers" in films from the 1930s until the 1950s, usually in supporting roles. He starred as the Cisco Kid in six westerns made between 1939 and 1941. Romero danced and performed comedy in the 20th Century Fox films he starred in opposite Carmen Miranda and Betty Grable, such as Week-End in Havana and Springtime in the Rockies, in the 1940s. He also played a minor role as Sinjin, a piano player in Glenn Miller's band, in the 1942 20th Century Fox musical Orchestra Wives.  In The Thin Man (1934), Romero played a villainous supporting role opposite the film's main star William Powell. Many of Romero's films from this early period saw him cast in small character parts, such as Italian gangsters and East Indian princes. Romero had a lead role as the Pathan rebel leader, Khoda Khan, in John Ford's British Raj-era action film Wee Willie Winkie (1937) and The Little Princess (1939) alongside Shirley Temple. He also appeared in a comic turn as a foil for Frank Sinatra and his crew in Ocean's 11 (1960).  Romero sometimes played the leading man, for example in Allan Dwan's 15 Maiden Lane (1936) opposite Claire Trevor, as well as winning the key role of the Doc Holliday character (with name changed to "Doc Halliday") in Dwan's Wyatt Earp saga Frontier Marshal three years later. 20th Century Fox, along with mogul Darryl Zanuck, personally selected Romero to co-star with Tyrone Power in the Technicolor historical epic Captain from Castile (1947), directed by Henry King. While Power played a fictionalized character, Romero played Hernan Cortes, a historical conquistador in Spain's conquest of the Americas.

Answer this question "What role was he most noted for?" by extracting the answer from the text above.
in John Ford's British Raj-era action film Wee Willie Winkie (1937) and The Little Princess (1939) alongside Shirley Temple.