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http://archaeologyinbulgaria.com/2020/11/17/pillow-brick-with-gospel-of-john-inscription-in-13th-century-clergyman-grave-byzantine-gold-threads-found-in-medieval-bulgarian-capital-tarnovgrad/
'Pillow' Brick with Gospel of John Inscription in 13th Century Clergyman Grave, Byzantine Gold Threads Found in Medieval Bulgarian Capital Tarnovgrad