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In page Flag of Luxembourg:

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The colours of the flag of Luxembourg were first adopted around 1830 during the Belgian Revolution.[citation needed] They were probably derived from the coat of arms of the County and later Duchy of Luxembourg, which in turn was derived from the combination of the lion of the dukes of Limbourg and the supposed striped banner of the early counts of Luxembourg.[citation needed] The three-coloured horizontal design was fixed on 12 June 1845.