|Full name||Holy Monastery of Koutloumousiou|
|Dedicated to||Transfiguration of the Saviour|
|Prior||Archimandrite Elder Nikolaos|
|Location||Mount Athos, Greece|
|Public access||Men only|
The Koutloumousiou Monastery (Greek: Μονή Κουτλουμουσίου) or Koutloumousi (Κουτλουμούσι) is an Eastern Orthodox monastery in the monastic state of Mount Athos in Greece. The monastery ranks sixth in the hierarchy of the Athonite monasteries.
The monastery was raised with the help of voivodes Nicolae Alexandru Basarab and Vladislav Vlaicu from Wallachia, while other Wallachian voivodes contributed with substantial financial donations (Mircea cel Bătrân, Laiotă Basarab, Basarab cel Tânăr, Vlad al IV-lea Călugărul, Vlad al VI-lea Înecatul, Vlad al VII-lea Vintilă, Radu cel Mare, Neagoe Basarab.).
The monastery's library contains 662 manuscripts and approximately 3,500 printed books.
It has 26 working monks.
A. E. Bakalopulos (1973). History of Macedonia, 1354-1833. [By] A.E. Vacalopoulos. p. 166.
At the end of the 15th century, the Russian pilgrim Isaiah relates that the monks support themselves with various kinds of work including the cultivation of their vineyards....He also tells us that nearly half the monasteries are Slav or Albanian. As Serbian he instances Docheiariou, Grigoriou, Ayiou Pavlou, a monastery near Ayiou Pavlou and dedicated to St. John the Theologian (he no doubt means the monastery of Ayiou Dionysiou), and Chilandariou. Panteleïmon is Russian, Simonopetra is Bulgarian, and Karakallou and Philotheou are Albanian.
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