Leinster Rugby () is one of the four professional provincial club rugby union teams from the island of Ireland and the most successful Irish team domestically. They compete in the United Rugby Championship and the European Rugby Champions Cup. Leinster play their home games primarily at the RDS Arena, although larger games are played in the Aviva Stadium when the capacity of the RDS is insufficient. Before moving to the RDS in 2005, Leinster's traditional home ground was Donnybrook Stadium, in Dublin 4. The province plays primarily in blue with white or yellow trim and the team crest features a harp within a rugby ball, the harp being an ancient symbol of the province found in and taken from the flag of Leinster, although the traditional colours of Leinster Rugby mean the design more resembles the flag of the President of Ireland or the Coat of arms of Ireland. Leinster turned professional along with its fellow Irish provinces in 1995 and has competed in the United Rugby Championship (formerly known as the Celtic League, Magners League and the Pro12 / Pro14) since it was founded in 2001, having previously competed in the annual Irish interprovincial championship. History Founding (1879–1899) The Leinster Branch was inaugurated at a meeting on 31 October 1879. The meeting was held at Lawrence's premises at 63 Grafton Street and was largely attended. Although this was the formal founding of Leinster as we know it today, with the amalgamation of the Irish Football Union and the Northern Union, the Leinster provincial team had been active since 1879 – when the first interprovincial derby was played against Ulster. The Leinster and Ulster teams also made up the representative Irish team that competed against England in Ireland's first-ever international in 1875. Upon the founding of the union, Munster were also added to the fray in 1879, when their first provincial team was selected and first Munster players represented Ireland. F. Kennedy (Wanderers) was elected first Hon. Secretary of the Branch and C.B. Croker (Lansdowne) first Hon. Treasurer. The function of the Branch was to organise the game of rugby football in the province. Every year five representatives would be selected to join the IRFU Committee. They would be known was the "Leinster Five" and would pick the Leinster representative teams. The first Interprovincial matches between Leinster, Ulster and Munster were held in 1875. At this time the matches were