John Surwillo

Served the Grand Masters of the Teutonic
Knights and participated in a number of diplomatic missions to the Grand Duchy of Lithuania. It is highly plausible that Jonas 11 was also in the secret service of Grand Duke Vytautas
and King Wladyslaw 11 Jagiello.

By the mid-1420s Jan 11 and Mark had
sold all their property in Barciany region (Tariawki, Surwile and Sztynorcka Forest) and
part of their lands in Trinkheim region (Attagauthen). The only possessions left to the Surwillo were near Trinkheim in Brandenburg region.: https://www.istorija.lt/data/public/uploads/2021/04/lietuvos-istori... (page 43)

Minimas šiame straipsnyje: https://www.aidas.lt/lt/istorija/article/28037-2022-07-30-butautas-...

Served the Grand Masters of the Teutonic
Knights and participated in a number of diplomatic missions to the Grand Duchy of Lithuania: https://www.istorija.lt/data/public/uploads/2021/04/lietuvos-istori... (page 43)