The nickname "Maiden City" is sometimes utilised; for example, the Ulsterbus service from Belfast to Derry is called "The Maiden City Flyer". This alludes to the city's having resisted capture in the siege of 1689. However, since the siege is an event celebrated by unionism, the nickname is itself politically charged. The Northern Ireland Tourist Board has used "the Walled City" and "Legenderry" [also "LegenDerry"] in marketing the area and naming visitor events and attractions.