'rightly-proclaimed' originates from the combination of 'rightly' and 'proclaimed', where 'rightly' means 'in a just or proper manner' and 'proclaimed' means 'announced officially or publicly'.

'rightly' and 'proclaimed' have been used separately in English since the Middle Ages, and their combination into 'rightly-proclaimed' is a modern usage to emphasize the correctness of a proclamation.

Initially, 'rightly' and 'proclaimed' were used separately, but their combination emphasizes the correctness and justice of a proclamation.