The New Testament uses several terms to convey the notion of preaching the gospel, one of them being proclaim.
This term describes what a herald does in relation to a message that a superior (e.g., a king) wants the citizenry to know. King Ahasuerus had Haman make a proclamation concerning Mordecai (Esther 6:11); Jonah proclaimed a message of doom in Nineveh (Jonah 3:2, Jonah 3:4–5); Noah was a “herald [same word] of righteousness” to the generation before the flood (2 Peter 2:5). Jesus’ resurrection from the dead gave him authority to “proclaim” (or to instruct another to proclaim on his behalf) and at the same time provided a message worth proclaiming.
19 in which he went and proclaimed to the spirits in prison,