그와 거의 같은 시대의 상인으로서 인도와 중국까지 내왕했던 술레이만(Sulayman)도 거의 같은 내용을 되풀이했고, 10세기 초의 이븐 스테(Ibn Rosteh)도 그의 백과사전에서 같은 소리를 하고 있다. 10세기 중엽에 가서 여행가인 마스디(Masudi)는 그의 '황금목장 급 귀금석광(黃金牧場 及 貴金石鑛)'에서 여러 번에 걸쳐서 신라에 대해 언급하였는데 본질적으로는 전자보다 추가된 것이 없다. 그러나 신라의 풍광이 아름다움은 한층 더 강조된다.
"중국 건너편 바다쪽에는 신라라는 나라와 그에 예속된 도서(島嶼)들을 제외한다면 우리에게 알려져 있는 왕국이나 나라는 없다. 이상한 사실은 이락 지방이나 기타 외국으로부터 신라로 건너간 와국인은 다시 떠나지 않는다는 점이다. 왜냐 하면 거기는 공기가 맑고 물이 깨끗하고 토양은 비옥하고 모든 것이 편안하기 때문이다. 그 나라의 주민은 중국과 우호 관계에 있으며 신라는 중국의 왕들에게 끊임없이 공물을 바친다".
Abu'l Qasim Ubaid'Allah ibn Khordadbeh (Persian: ابوالقاسم عبیدالله ابن خردادبه) (c. 820 – 912 CE), author of the earliest surviving Arabic book of administrative geography,[1] was a Persian geographer and bureaucrat of the 9th century. The son of a wealthy Persian family in northern Iran, he was appointed "Director of Posts and Intelligence" for the province of Djibal in northwestern Iran under the Abbasid Caliph al-Mutammid (ruled 869–885 CE). In this capacity ibn Khordadbeh served as both postmaster general and the Caliph's personal spymaster in that vital province.
Around 846-847CE ibn Khordadbeh wrote Kitāb al Masālik w’al Mamālik (The Book of Roads and Kingdoms) (with the second edition of the book being published in 885CE).[2] In this work, ibn Khordadbeh described the various peoples and provinces of the Abbasid Caliphate. Along with maps, the book also includes descriptions of the land, people and culture of the Southern Asian coast as far as Brahamputra, The Andaman Islands, peninsular Malaysia and Java. The lands of Tang China, Unified Silla (Korea) and Japan are referenced within his work.
Ibn Khordadbeh clearly mentions Waqwaq twice: East of China are the lands of Waqwaq, which are so rich in gold that the inhabitants make the chains for their dogs and the collars for their monkeys of this metal. They manufacture tunics woven with gold. Excellent ebony wood is found there.” And again: “Gold and ebony are exported from Waqwaq.[3]
The book does not reflect a strong influence from Greek earlier works such as Ptolemy's. The work uses heavily Persian administrative terms, gives considerable weight to Pre-Islamic Iranian history, uses native Iranian cosmological division system of the world. These reflect the existence of Iranian sources at the heart of the work.[4]
It is one of the few surviving sources that describes Jewish merchants known as Radhanites.
Khordadbeh wrote other books. He wrote around 8-9 other books on many subjects such as "descriptive geography" (the book Kitāb al Masālik w’al Mamālik), "etiquettes of listening to music", "Persian genealogy", cooking", "drinking", "astral patterns", "boon-companions", "world history", "music and musical instruments". The book on music had the title Kitāb al-lahw wa-l-malahi which is on musical matters of Pre-Islamic Persia