Scottish Kings 1005 – 1625, by Sir Archibald H Dunbar, Bt., Edinburgh, 1899, p. 127, where Robert the Bruce's birthplace is given "at Writtle, near Chelmsford in Essex, on 11 July 1274". Baker, cited above, is also mentioned with other authorities.
The exact location is uncertain and it may not have been very near the modern village of Cardross, although it was probably in Cardross Parish. Barrow suggests that it was at present-day Mains of Cardross farm on the outskirts of Dumbarton, beside the River Leven. [1]