The monastery, consecrated to St. Peter and Paul, was founded before 763 by Reginperht and Irminfried, members of the local aristocratic Huosi family . The central person of the Reginperht family, the vir nobilis Poapo , who is also the namesake of the Adelsgau pagus Poapinta near Innsbruck, which partly came to the Scharnitz monastery and later to the Schlehdorf monastery .
The management of the monastery was entrusted to Archipresbyter Arbeo , who was appointed Bishop of Freising the following year . His successor as abbot was Atto , under whom, after a major fire, the monastery between 769 and 772 - possibly on the advice of Bishop Arbeo - moved to Schlehdorf Monastery on the Kochelsee.
In 1972 remains of the Benedictine monastery were unearthed during excavations, which experts described as "remarkable".
- Walter Sage: The early medieval monastery in the Scharnitz. The excavations on the "Kirchfeld" in Klais, municipality of Krün, district of Garmisch-Partenkirchen, in the years 1968 - 1972. In: Contributions to the old Bavarian church history. Volume 31, Franz X. Seitz & Val. Höfling, Munich 1977, ISBN 3-87744-026-6 .
- Wolfgang Wüst: A monastery in the Scharnitz. In: Municipality of Krün (ed.): 1250 years of Klais. 763-2013 - History and development of the place on Römerstrasse. Schober, Krün 2013, OCLC 854741846 , pp. 15-27.
- Wilhelm Störmer: Nobility groups in early and high medieval Bavaria. Commission for Bavarian State History, Munich 1972, ISBN 3-7696-9877-7 , p. 96.
- Max Spindler (Ed.): Handbook of Bavarian History. Volume I: Old Bavaria, the tribal duchy until the end of the 12th century. Verlag CH Beck 1981, ISBN 3-406-07322-0 , pp. 215f. ( Google Book Preview ).
- Whether the discovered church complex is actually the former Scharnitz monastery is not undisputed, cf. Johannes Pöll: Archeology in monasteries in North Tyrol - a synopsis. In: Michaela Frick, Gabriele Neumann (Hrsg.): Pay attention and preserve. Caramellen for the preservation of monuments, art and cultural history of Tyrol. Festschrift for the 60th birthday of Franz Caramelle. 2005, , p. 241.