From this point on, he kept a full journal of his travels (April 1808 to March 1809), describing his exploration of Jordan, Palestine, the wilderness of Sinai, Cairo and the Fayum.

From Egypt he went by sea to Jeddah and reached Mecca as a pilgrim in October 1809, after which he converted to Islam and changed his name to Musa Al-Hakim.

In September of the following year he left Mocha with the hope of reaching Muscat, but was found dead two days later, allegedly poisoned by his guides on orders from the imam of Sana'a.

Kruse, 4 vols, Berlin, 1854), the only printed records are a series of letters and papers in Zach's Monatliche Correspondenz and Hammer's Fundgruben.

"[4] In 1826, Robert Brown published Seetzenia which is a genus of flowering plants from Africa and Asia, belonging to the family Zygophyllaceae and named in his honour.