Isma'ilis in the Yaman
'Ubayd-allâh al-Mahdî billâh, the Fatimid caliph, 297-322 H./910-934 AD Sudaysî dirham no date, Tukhlâ. Peli 55.6. 0.34 g.; Very fine
Tukhlâ was the early centre of the Fatimid missionaries in the Yaman during the lifetime of the Mahdî. Coins with the caliphal laqab al-Mahdî li-dîni llâh were obviously struck by a non-Fatimid Mahdî.