Eugene Louis Vidal was not baptized until January 1939, when he was 13 years old, by the headmaster of St. Albans school, where Vidal attended preparatory school. The baptismal ceremony was effected so he "could be confirmed [into the Episcopal faith]" at the Washington Cathedral, in February 1939, as "Eugene Luther Gore Vidal". He later said that, although the surname "Gore" was added to his names at the time of the baptism, "I wasn't named for him [maternal grandfather Thomas Pryor Gore], although he had a great influence on my life." In 1941, Vidal dropped his two first names, because he "wanted a sharp, distinctive name, appropriate for an aspiring author, or a national political leader ... I wasn't going to write as 'Gene' since there was already one. I didn't want to use the 'Jr.'"
Raised in Washington, D.C., Vidal attended the Sidwell Friends School and the St. Albans School. Given the blindness of his maternal grandfather, Senator Thomas Pryor Gore, of Oklahoma, Vidal read aloud to him, and was his Senate page, and his seeing-eye guide. In 1939, during his summer holiday, Vidal went with some colleagues and professor from St. Albans School on his first European trip, to visit Italy and France. He visited for the first time Rome, the city which came to be "at the center of Gore's literary imagination", and Paris. When the Second World War began in early September, the group was forced to an early return home; on his way back, he and his colleagues stopped in Great Britain, and they met the U.S. Ambassador to Great Britain, Joe Kennedy (the father of John Fitzgerald Kennedy, later the President of the United States of America). In 1940 he attended the Los Alamos Ranch School and later transferred to Phillips Exeter Academy, in Exeter, New Hampshire, where he contributed to the Exonian, the school newspaper.