The Sixteenth Council of Toledo first met on 25 April 693, the second of Egica's three councils.
In 692, the archbishop of Toledo, Sisebert, led a rebellion with many nobles to install one Suniefred as king. The rebellion was put down in the latter half of that year and, at an unusual spring day, Egica called a general council of the church in Spain to deal with the future security of the kingship and the discipline of the renegades. Sixty bishops, five abbots, and six counts attended the council. The bishops of Narbonensis could not attend on account of an epidemic.
The king opened the council with a speech declaring that any officials who betrayed the trust of the Gothic people would be driven from office and enslaved to the treasury, forfeiting their property to the royal coffers. The king, the council concurred, could bestow this confiscated property on anyone he wished, the church obviously not excluded. The descendants of rebels were likewise prohibited from holding any palatine office. Finally, the rebels were anathematised on the basis of the seventy-fifth canon of the Fourth Council.
On 2 May, the final day of the council, the bishops solemnly excommunicated Sisebert for life and defrocked him. He would be allowed communion on his deathbed only, unless the king pardoned him earlier. Without precedent, the bishops transferred the archbishop of Seville, Felix, to Toledo and the archbishop of Braga, Faustinus, to Seville. They also ordered the bishops of Narbonensis to approve the decrees of the Sixteenth Council in a local synod of their own.
The council also reformed the laws of the realm on several points. Incorporated into the Forum Iudicum formulated by Chindasuinth, published by Recceswinth, and modified by Erwig was the law that any oath rendered unto anybody other than the monarch was invalid and illegal. A few laws were revoked and some were reestablished, such as that prohibiting the mutilation of slaves.