Around 1560–80, most of the citizens, some 8.000 people, still lived on Stadsholmen. This central island was at this time densely settled and the city was now expanding on the ridges surrounding the city. Stockholm had no private palaces at this time and the only larger buildings were the castle, the church, and the former Greyfriars monastery on Riddarholmen. The surrounding ridges, unable to boast a single timber framed building, were mostly used for activities that either required a lot of space, produced odours, or could cause fire. Even though some burghers had secondary residences outside the city, the population living on the ridges, perhaps a quarter of the city's population, were mostly poor, including the royal personnel occupying the ridges north of the city.