As apparent from its
coat of arms, Upplands-Bro takes pride in its pre-historic history, and boasts some of the oldest ancient remains in Sweden. From the
Iron Age, about 4,000 burial places have been found, and the remains from the
Viking Age include 20
runestones. The figure in the coat of arms comes from one of these remains, a 3 cm tall bronze figure found near Kungsängen. Every one of the six
parishes also hosts a
medieval church, built between 1100 and 1400. In the 15th century, the fortress
Almarestäket was built in the municipality, just east to the present location of Kungsängen. It was the seat of the
Swedish archbishop until the Archbishop
Gustav Trolle besieged himself there in 1517, leading to the demolition of the fortress in 1519. The ruins can still be visited. Since 1970, the main base of the combined
cavalry/
infantry regiment
Life Guards is located in Upplands-Bro. The regiment trains
conscript companies of
mechanized infantry,
Royal Guards and
military police. It is also the home of the Swedish Armed Forces International Centre (Swedint). ==Demographics==