A.T. Robertson Commentary Acts 14:13

"And the priest of Jupiter whose [temple] was before the city, brought oxen and garlands unto the gates, and would have done sacrifice with the multitudes." — Acts 14:13 (ASV)

Whose temple was before the city (του οντος προ της πωλεως). The god (Zeus) is identified with his temple. He had a statue and temple there.

Oxen and garlands (ταυρους κα στεμματα). Probably garlands to put on the oxen before they were slain. It was common to sacrifice bullocks to Jupiter and Mercury.

Would have done sacrifice (ηθελεν θυειν). Imperfect indicative, wanted to offer sacrifice. He was planning to do it, and his purpose now became plain to Paul and Barnabas.