Teacher Deity
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In Sri Lankan Buddhism guru is a title for a living human teacher, not a name for a god, and this corpus record should be understood as a page about an institution rather than a deity-page. Sinhala usage distinguishes the ordained monk (the therō or bhikkhu), the lay teacher (guru-guṇay) and the teacher of Buddhist subjects taught in Pali and Sanskrit. There is no singular Sinhala "guru deity"; where this entry is filed among deities, that filing is a metadata convenience and a slightly misleading one.
What does exist — and this is the substantive part of the entry — is the practice of honouring individual monks after death as guru, and of seeking their intercession. Sri Lanka has a well-documented tradition of monk-saints (guru-santo) who attract a following in life and receive veneration at their āṭana (cremation site) or at the shrine where they lived after they are gone. The best-known figure is Ānanda Maṅgala Thero of Matalé (d. 1944), whose posthumous cult — blessings sought from his relics and images, devotees taking vows at his shrine, and the annual perahera that gathers large crowds — was documented at length and is a genuine social phenomenon of modern Sri Lanka rather than an ancient cult. Other teachers of the same broad type are less documented and should not be listed as though they were equivalent.
Two cautions. First, the tradition of the guru-saint is modern in its current form: it took shape in the nineteenth and twentieth centuries, in a society undergoing religious and political reform, and reading it back into the classical period is an error. Second, some Sinhala terms for these figures (guru, śrī paṇḍita, adhipati) are used loosely in modern writing; the distinction between a teacher, a saint and a monk-author should be kept.
John Clifford Holt's two studies of the Ceylon Buddhist revival are the right frame: they document the social setting in which posthumous guru-veneration arose, and Holt's work on late-medieval Buddhist kingship is relevant background for the older material.
A named guardian should check, ideally a Sinhala speaker: which teachers the corpus intends this entry to cover, since the record names none; whether Ānanda Maṅgala Thero's cult should have its own record (it probably should); and the Sinhala terminology, which is frequently mistranslated in English-language summaries.