Posthumous coins of the Legnica-Brzeg Piasts by Robert Pieńkovski

“…Posthumous coins are an interesting supplement to the funeral ceremonies and a valuable - still sought after memento of the Piast dynasty. …”
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Dlaczego w czasach jagiellońskich zanika w Polsce pieczęć majestatyczna? by Michał Knapik

“…According to the author, the disappearance of the Polish majestic seal was the result of the crisis and dispersion of royal majesty as a result of the final extinction of the Piast dynasty at the end of the fourteenth century.   …”
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