Trelleborg is a collective name for six Viking Age circular forts, located in Denmark and the southern part of modern Sweden. Five of them have been dated to the reign of the Harold Bluetooth of Denmark (died 986). The fort in Borgeby has been dated to the vicinity of 1000 AD, so it is possible that it too, was built by the same king. This type of fortification is also named after the first discovered example; Trelleborg near Slagelse, excavated 1936-1941).
The Madrid Assembly is the unicameral regional legislature of the Autonomous Community of Madrid since the approval of the Madrid Charter of Autonomy in 1983. It is elected every four years during the Spanish Regional and Municipal elections, as the Community of Madrid Charter of Autonomy does not recognise the right to call early elections, save for exceptional situations like the scandal that deadlocked the May 2003 Assembly and forced fresh elections in October 2003.