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fetial

adjective

concerned with declarations of war and treaties of peace: fetial law.

noun plural fetiales (ˌfiːʃɪˈeɪliːz)

(in ancient Rome) any of the 20 priestly heralds involved in declarations of war and in peace negotiations

adjective

of or relating to the fetiales
a less common word for heraldic

adj.

1530s, “pertaining to the Fetiales,” the Roman diplomatic corps, a college of 20 priests whose duty was to act as heralds and maintain the laws of war, from Latin fetiales “speaking, negotiating, diplomatic,” of unknown origin.