Zaydi Imams of the Banu Hamza
al-Mutawakkil 'alâ llâh Ahmad, 623-656 H./1226-1258 AD, naming him as heir to his father al-Mansûr. Mansûrî dirham 641 H., Birâsh. 1.69 g.; Very rare Good very fine
Among the five places called Birâsh listed in the Mu'jam al-buldân wa l-qabâ'il al-yamanîya, p. 66, the castle in the West of the territory of the Hâshid tribe is probably meant.