Albert Barnes Commentary John 18:13

"and led him to Annas first; for he was father in law to Caiaphas, who was high priest that year." — John 18:13 (ASV)

To Annas first. Probably his house was nearest to them, and he had great authority and influence in the Jewish nation. He had been himself a long time high-priest; he had had five sons who had successively enjoyed the office of high-priest, and that office was now filled by his son-in-law. It was of importance, therefore, to obtain his sanction and counsel in their work of evil.

That same year. (John 11:14).

the high priest (John 18:24).