House of Boyd
Cadet branch of the House of Stewart
- Coat of Arms
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House of Boyd
Lords and Earls of Kilmarnock
Lords Boyd -
House of Hay
Lords Hay and Slains
Earls of Erroll
Barons Kilmarnock
Hereditary High Constables of Scotland
Adopted the name and arms of House of Hay upon succeeding to Earldom of Erroll -
House of Hay
Earls of Erroll
Hereditary High Constables of Scotland
Arms from 18th Earl who married Elizabeth FitzClarence, illegitimate daughter of King
William IV of United Kingdom
After 1846
- Cadet Branches
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House of Boyd
Barons Kilmarnock
Issued from Gilbert Boyd, 2nd son of Victor Alexander Hay, 21st Earl of Erroll and younger brother of Josslyn Hay, 22nd Earl
From 6th Baron onward
Re-assumed the paternal name of Boyd -
House of Moncreiffe-Hay
Lords Hay and Slains
Earls of Erroll
Issued from Diana Hay, 23rd Countess of Erroll, only child and heiress of Josslyn Hay, 22nd Earl of Erroll
Matrilineal branch