It was called in response to a letter from Pope Leo II directing the king, a Count Simplicius, and the recently deceased Quiricus, metropolitan of Toledo, to call a general council to confirm the decisions of the ecumenical Third Council of Constantinople (or sixth ecumenical council) against monothelitism.
A regional synod held in Carthaginiensis with representatives of the metropolitans in attendance was not sufficient and Erwig subsequently called a general council, a year and a day after the disbanding of the Thirteenth Council of Toledo on 13 November 683.
The council, due to bad weather and the recent travels to and from Toledo for the Thirteenth Council, was attended only by the bishops of Carthaginiensis, the metropolitans, and a bishop from each of the other provinces: Narbonensis, Tarraconensis, and Gallaecia.
It also issued a general warning to the people that such doctrinal matters were to be believed, not discussed.
The bishops concluded their short business and closed the council on 20 November 684.