In that book were [entered] the coeval exploits and synchronisms of the kings of Ireland with the kings and emperors of the world, and of the kings of the provinces with the monarchs of Ireland.
In it was also written what the monarchs of Ireland were entitled to [receive] from the provincial kings, and the rents and dues of the provincial kings from their subjects, from the noble to the subaltern.
In it, also, were [described] the boundaries and mears of Ireland from shore to shore, from the provinces to the cantred, from the cantred to the townland, from the townland to the traighedh of land."[106] Although the Saltair of Tara has disappeared from our national records, a law tract, called the Book of Acaill, is still in existence, which is attributed to this king.

It is always found annexed to a Law Treatise by Cennfaelad the Learned, who died A.D.677.

In an ancient MS.

in Trinity College, Dublin (Class H.L.15, p.

149), it is stated that it was the custom, at the inauguration of Irish chiefs, to read the Instructions of the Kings (a work ascribed to Cormac) and his Laws.
There is a tradition that Cormac became a Christian before his death.