Over the past few decades, there have been repeated cases of deliberate destruction of Islamic manuscripts. For example, a large portion of the manuscript holdings of the libraries of Iraq was either destroyed or looted in the aftermath of the 1991 Gulf War and again in March 2003, following the invasion of Iraq by American and British troops. It is also worrying that Islamic manuscripts of uncertain provenance continue to be auctioned off into private hands, many among them apparently of Iraqi provenance. The lecture will showcase some recent examples of particularly precious Arabic manuscripts from the thirteenth and fourteenth century in the realm of Islamic philosophy, logic and exegesis that surfaced on the market in recent years and have vanished since.