al-Qasim 1 | Prosopography of the Byzantine Empire |
| Sex | M |
| Floruit | E IX |
| Dates | 809 (taq) / 809 (tpq) |
| Variant Names | Q'sm |
| Religion | Muslim |
| Ethnicity | Arab |
| Locations | Syria (officeplace); Syria |
| Textual Sources | Chronicon Anonymi ad annum 1234 pertinens, ed. and tr. J.-B. Chabot, I = CSCO 81-82 (Paris, 1916-20), II = CSCO 109 (Louvain, 1937) (chronicle) |
Al-Qasim 1 was the third and youngest son of the caliph Harun al-Rashid (Harun 1); his brothers were al-Amin 1 and al-Ma'mun 1; his father placed al-Qasim 1 in charge of Syria when Harun 1 left for Khorasan shortly before Harun 1's death in 809; under arrangements made by Harun 1, al-Qasim 1 was supposed to succeed his two older brothers as caliph, but this arrangement was broken by the civil war between al-Amin 1 and al-Ma'mun 1: Chron. 1234, §192 (II, p. 7), §194 (II, p. 8).
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