Time windows after al-Dhahabī.
Al-Dhahabī (d. 748/1348) divides his Tārīkh al-Islām into seventy ṭabaqāt covering the Hijri years 1–700; each ṭabaqa spans ten years and gathers the figures who died within it. The atlas places scholars in the ṭabaqa of their death year by the same logic.
Finding the ṭabaqa
A scholar's ṭabaqa is the death year divided by ten and rounded up: Mālik b. Anas, who died in 179, belongs to ṭabaqa 18 (171–180).
Time windows
A single ṭabaqa is the finest scale; 25-, 50- and 100-year windows merge neighbouring ṭabaqāt to reveal when regions rose and declined.
After al-Dhahabī
Tārīkh al-Islām ends in the year 700. Later centuries continue in the same ten-year rhythm and are marked as the period of its continuations (dhuyūl).
Assigning centres
Scholars are placed not at their place of death but at their main centre of learning: residence first, otherwise the place of their nisba. Riḥla and migration records form a separate layer of arcs.
Travel routes
The riḥla lens: journeys dated in the sources, journeys given a year by the model estimate, and journeys with no known year, each drawn differently.
liveNetwork of connections
A network explorer of teacher–student ties, with the shortest isnad path between two scholars.
liveComparing ṭabaqāt
The compare lens: the selected period against the previous period of equal length or any other period; growing and shrinking centres.
liveScholar profiles
A detailed record page for every scholar, with source citations.