The original wall-enclosed city only encompassed the central elevated area of the present old town located between the two long streets — Västerlånggatan and Österlånggatan (i.e. "Western/Eastern Long Street") — which passed between the shorelines of the era and the eastern and western city walls. The eastern wall passed between two defensive towers; the northern being that of what was to become the castle Three Crowns, destroyed by fire in 1697, and the southern, of which no archaeological traces have been found, is known to have been given to the Blackfriars by King Magnus Eriksson (1316–1377) in 1336 and therefore was arguably located at the location for the monastery, in the southern end of Prästgatan, north of the square Järntorget. The steep precipices forming the outskirts of the original city is still discernible in the pronounced difference of levels in today's urban landscape: The two long streets which ran just outside the city walls — Västerlånggatan and Prästgatan (some 5 metres) — and the streets running parallel to them, just inside the city walls — Österlånggatan and Bollhusgränd-Baggensgatan (up to 10 metres).