Alexander III initially refused to denounce them, mostly due to the strength of antipope Pascal III.
One event leading up to the creation of these measures was the trial of Philip Brois at the assizes of Dunstable. Their most famous opponent argued against them by citing the Decretum of Gratian and the Pseudo-Isidorean Decretals. Alexander III initially refused to denounce them, mostly due to the strength of antipope Pascal III. Supporters of them, such as Josceline of Salisbury and Gilbert Foliot, were excommunicated after the disastrous council of Northampton. The 7th article prevented excommunication of the king and royal officials, but the most controversial article was the 3rd, which provided for the prosecution of church officials in lay courts. FTP, name this set of laws promulgated in 1164 by Henry II and opposed by the archbishop of Canterbury, Thomas a Becket.
One event leading up to the creation of these measures was the trial of Philip Brois at the assizes of Dunstable.
{Constitutions of Clarendon}