while Muslim records thirty-five, and the Musnad of Baqī ibn Makhlad—counting the repeated isnāds—contains eight hundred and forty. And so it goes: he seldom leaves a single ḥadith transmitter without noting this statistic. These additions—quite apart from their absence in Tārīkh al-Islām—constitute a vast extra treasure whose true worth is recognized by learned specialists; they bear witness to his prodigious erudition and meticulous precision. (1)

5 – To all of the foregoing we must add that al-Dhahabī composed Siyar after Tārīkh al-Islām, indeed after authoring a number of his other books. This brings two principal benefits: first, the infusion of new material and a fresh re-ordering; second, it shows that throughout that intervening period he revisited the earlier content, presenting it only after further verification and scrutiny, so that the work represents the form he deemed acceptable in the closing years of a scholarly life crowded with monumental writings.

Its significance for the history of intellectual life:

Siyar is among Imām al-Dhahabī’s largest compositions after his monumental Tārīkh al-Islām. He gathered within it an immense body of biographical information covering nearly seven hundred years, while preserving geographical balance across the vast expanse of Islamic territories—from al-Andalus in the west to the farthest reaches of the east. The book is likewise comprehensive in the kinds of figures it covers, embracing every field of human endeavor and not restricting itself to any particular group. Thus it has become one of the rare works whose equal is hard to find in the annals of the Arab-Islamic intellectual movement, and, as a result,