3 years after James VI of Scotland inherited the English & Irish thrones in 1603, becoming James I of England, a royal decree created a new flag for maritime purposes, combining the Cross of St George and the Saltire of St Andrew, though the Acts of Union were not passed until 1706/7. The Saltire of St Patrick was added following the Acts of Union with Ireland in 1801, creating a #UnitedKingdom.
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