Original: Alexander III ( Medieval Gaelic : Alaxandair mac Alaxandair ; Modern Gaelic : Alasdair mac Alasdair ) ( 4 September 1241 -- 19 March 1286 ) , King of Scots , was born at Roxburgh , the only son of Alexander II by his second wife Marie de Coucy .
Simplified: Alexander III ( Mediaeval Gaelic : Alaxandair mac Alaxandair ; Modern Gaelic : Alasdair mac Alasdair ) , King of Scots , was born at Roxburgh on 4 September 1241 and died on 19 March , 1286 .