Why did Zadok the priest anoint Solomon king rather than Nathan the prophet (1:36)?
Kings chosen by God to rule over his people who were not in a line of dynastic succession were anointed by prophets (Saul, 1 Samuel 9:16; David, 1 Samuel 16:12; Jehu, 2 Kings 9). Kings who assumed office in the line of dynastic succession were anointed by priests (Solomon, here; Joash, 2 Kings 11:12).