Wikipedia
Buzurg Ibn Shahriyar of Ramhormuz, was allegedly a Muslim traveler, sailor, cartographer and geographer who was born in Khuzistan in Persia. In the year 953 he supposedly completed a collection of narratives from Muslim sailors based in Siraf, Oman, Basra and elsewhere.
In this work, there are mentions of how Muslim seafarers traveled to India, Malaysia, Indonesia, China and East Africa. Various links are mentioned between the Abbasid Caliphate and Tang dynasty, China.
However, it is now believed that Buzurg is probably a purely fictional personage. Apart from the attribution of this book to him, his existence is otherwise unattested. The attribution apparently dates from the thirteenth century, long after he allegedly lived. Recent research has shown that the book was more probably written in Cairo during the second half of the tenth century, by a scholar called Abū ‘Imrān Mūsā ibn Rabāḥ al-Awsī al-Sīrāfī.