When Ahmad Ibn Tulun arrived to
Egypt
, he had to compete with Ibn el-Mudabbir . Ibn el-Mudabbir was one of the famous figures who had a very close relation to el-Mutawakel , the Caliph and one of his high officials . The Caliph appointed him to be responsible for the Kharaj tax in Egypt and more than other seven jobs . Ibn el-Mudabbir ill-treated the Egyptians and used violent , abusive ways in collecting the Kharaj .
When Ahmad Ibn-Tulun came to Egypt , he became the Chief of Administration and Prayer , while Ibn el-Mudabbir was the Chief of Finance and collecting the Kharaj . Ahmad Ibn Tulun refused to leave Ibn el-Mudabbir collect the money and ill-treat the Egyptians in this way . So Ibn el-Mudabbir , decided to keep Ibn Tulun in his side by sending him gifts , horses and slaves , but the latter refused to take these gifts and returned them to the former . Moreover , Ibn Tulun wanted to reduce from the rank of Ibn el-Mudabbir between people . To achieve this goal , he sent to Ibn el-Mudabbir , asking for compensation for the "100" slaves , who were serving el-Mudabbir everywhere .
As a response , Ibn el-Mudabbir plotted against Ibn Tulun and sent to the Caliph , saying that
Ibn Tulun was trying to be independent from the authority of the Caliphate . But as a counter plot , at that time , Ibn Tulun sent gifts to the Caliph , asking him to appoint Mohamed Ibn Helal , instead of Ibn el-Mudabbir and the Caliph agreed . But on Ibn el-Mudabbir's refusal , Mohamed Ibn Helal put him in prison .
Later , when El-Mutamid , the Caliph came to Egypt , he appointed Ibn el-Mudabbir on the Kharaj tax again . Then , he appointed him on the Kharaj tax of Syria and Jordan .
After a short time , the governor of Bilad el-Sham (Syria) escaped . So , Ibn Tulun invaded Syria , arrested Ibn el-Mudabbir and put him in prison until he died in it .
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