St John’s College has one Turkish manuscript. It is described in Emilie Savage-Smith, A Descriptive Catalogue of Oriental Manuscripts at St John’s College, Oxford (Oxford: Oxford University Press, 2005), pp. 107-10.
MS 253, item 5 (Savage-Smith no. 37)
The 5th item in MS 253 is an official letter in Turkish from a senior member of the Ottoman government. It was written in Constantinople in 1618.
Two catalogue entries available: Savage-Smith (2005) and Tiley (2018)