Like his predecessors, Bishop Abraham had been actively involved in missionary work among the Slavic populations east of the Alps, which explains why an area of Slovenia (Skofja Loka) was to become part of the distant Prince-Bishopric of Freising for several centuries.
Nagu tema eelkäijadki, tegeles piiskop Abraham aktiivselt misjonitööga slaavi rahvastiku seas Alpidest idas, mis selgitab, miks Sloveenia ala (Skofja Loka) sai kauge Freisingi vürstliku piiskopkonna osaks mitmeks sajandiks.