The Chronicle of Melrose records the marriage in 1162 of "Malcolm king of Scotland…his second sister Ada to Florence earl of Hoilande". Her birth date is estimated assuming that she was the second daughter of Earl Henry, and bearing in mind the estimated birth dates of his other children.... The Annales Egmundani record the marriage in 1162 of "Florentius comes Hollandiæ" and "sororem Regis Scottorum…Ada". The Chronologia Johannes de Beke records the marriage of Count Floris III and "Adam filiam Henrici prepotentis regis Scottorum". "Florentius tertius…comes Hollandie" donated the church of Vlaardingen, held by "patris mei Theoderici", to Egmond abbey by charter dated 28 Aug 1162, the dating clause of which refers to "anno primo…matrimonii nostri quo sororem regis Scotie Ade duxit uxorem". "Theodericus Hollandie comes…comitis Florentii et Ade comitisse filius" donated property at Poeldijk bij Naaldwijk to the church of St Maria, Utrecht by charter dated 1198, in the presence of "Ada mater mea, Willelmus frater meus comes Frisie, Margareta soror mea, Florentius frater meus…". "Ada…marchionissa de Brandebrug" donated land "on Pole" to Rijnsburg abbey, with the consent of "Wilhelmi comitis et Florentii fratrum meorum et Ade comitisse matris mee et Ade neptis mee", by charter dated 1205.
The Chronologia Johannes de Beke records the death "III Id Ian" of "Ada quidam Hollandie comitissa regie stirpis" and her burial in Middleburg monastery. Beke's Egmondsch Necrologium records the death "Id Jan" of "Ada comitissa filia Heynrici regis Scothorum". 1
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Florence III, Count of Holland, in 1162 m. Ada, sister of Malcolm IV. The Earldom of Ross, possibly then created for that purpose, is said to have been given him as her marriage portion. The Count took the Cross with the Emperor Frederick in 1188; the Emperor was buried in Antioch in 1190, and the Count soon afterwards. His widow was living in 1206. 2
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