Vajirananavarorasa (also spelled Wachirayan, Watchirayanawarorot, correct Pali spelling: Vajirañāṇavarorasa, Thai: วชิรญาณวโรรส, full title Somdet Phramahasamanachao Kromphraya Vajirananavarorasa สมเด็จพระมหาสมณเจ้ากรมพระยาวชิรญาณวโรรส ) (April 12, 1860, Bangkok, Thailand - August 2, 1921, Bangkok, Thailand) was the 10th Supreme Patriarch of Thailand from 1910 to 1921 . He helped to institutionalize Thai Buddhism.
Vajirañana was the 47th child of King Mongkut and was destined to become "the leading intellectual of his generation in Siam", in the words of the Thai historian David K. Wyatt (cited in Reynolds 1979:xiii). His royal name was Prince Manuṣyanāgamānob (พระองค์เจ้ามนุษยนาคมานพ) ('he who is a nāga among men') . Vajirañāṇavarorasa is the name he received on a gold nameplate together with the krommamuen rank on 16 March 1882.
Read more about Vajirananavarorasa: Childhood and Early Education, Ordination and Early Years in The Sangha, 1879-1892, Middle Years, 1892-1910, Later Years, 1910-1921