In the 5th century CE, the Qurayza lived in Yathrib together with two other major Jewish tribes, the Banu Qaynuqa and Banu Nadir. Al-Isfahani writes in his 10th century collection of Arabic poetry that Jews arrived in Hijaz in the wake of the Jewish-Roman wars; the Qurayza settled in Mahzur, a wadi in Al Harrah. The 15th century Muslim scholar Al-Samhudi lists a dozen other Jewish clans living in the town of which the most important one was Banu Hadl, closely aligned with the Banu Qurayza. The Jews introduced agriculture to Yathrib, growing date palms and cereals, and this cultural and economic advantage enabled the Jews to dominate the local Arabs politically. Al-Waqidi wrote that the Banu Qurayza were people of high lineage and of properties, "whereas we were but an Arab tribe who did not possess any palm trees nor vineyards, being people of only sheep and camels." Ibn Khordadbeh later reported that during the Persian domination in Hijaz, the Banu Qurayza served as tax collectors for the shah.