The Iranian Muslims at this time started a new tradition, which made Islam appear as a partly Iranian religion. They pointed out that an Iranian, Salaman-I-Farsi, had a great influence on the prophet Muhammad. They also pointed out the legend that Husayn, the son of the fourth Caliph, had married a Sassanian princess named Shahrbanu (the Lady of the Land), whose son later became the fourth Muslim Imam (and started the Shia branch of Islam). The Iranian Muslims thus believed that Shia Islam was derived from Sassanian Royalty. These two beliefs made it easier for Zoroastrians to convert. An instance of religious oppression is recorded when an Arab governor appointed a commissioner to supervise the destruction of shrines throughout Iran, regardless of treaty obligations. One of the Umayyad Caliphs was quoted saying, ""milk the Persians and once their milk dries, suck their blood"".