King Muiredach Mag Aí aka Muiredach Muillethan mac Fergusso who died in 702 was the progenitor of the Síol Muireadaigh – a dynasty of related clans (síol = seed/descendants, Muireadaigh = of Muiredach) from north-central Connacht.

Irish surnames descending from the Síol Muireadaigh are: 

Additional Information
Date of Birth 0660 (circa)  
Date of Death 0702  
Associated Building (s) Rathcroghan Mound  
Father (First Name/s and Surname) Fergus aka Muirgius (d.654) son of Rogallach mac Uatach (d. 649) King of Connacht [Uí Briúin Ai sept]  
Names of Siblings    
Spouse (First Name/s and Maiden/Surname) Cacht of the Corco Cullu tribe [in Mag Aí]  
Names of Children Indrechtach mac Muiredaig Muillethan (d. 723) | Cathal mac Muiredaig Muillethan (d. 735), both reigned as kings of Connacht.  
Occupation King of Connacht (from the Uí Briúin branch of the Connachta) | Progenitor of the Síol Muireadaigh (Silmurray)  
View less entries

References

ORIENTATION: Chúige Chonnacht aka Connacht (former Ireland VIEW SOURCE
IRISH HEREDITARY SURNAMES: An Introduction Ireland VIEW SOURCE
SIOL MUIREADHAIGH / SILMURRAY: Wolfe 1923 Ireland VIEW SOURCE
The Silmurray Clans: Knox 1908 Ireland VIEW SOURCE

Buildings Associated with this Ancestor