サン・ジョヴァンニ洗礼堂
Julian Sleigh was born in Florence, Italy on October 6, 1927 where his father lectured at the British Institute, and was baptised in the Florence Baptistery in the Roman Catholic faith. He spent his early childhood and schooling there before the family moved to London just before the war. On completing school he studied at the London School of Economics. This was followed by two years of national service in which he was selected for officer training.