A small graveyard east of the church, in which excavations have unveiled remains of coffins and bones, is said to have been ravaged by King Gustav Vasa who was looking for raw material for his saltpetre production, a deed commented in the chronicles as Ej är kristeligt i väder så skjuta sina förfäder ("Not Christian is in public thus shoot/push one's ancestors").
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It derives its name from the church of the Order of Saint John, in the early 16th century found north of the eastern part of the alley.