I cannot write the overview based solely on the provided context, as it only identifies the Abbasids as a "Muslim Hijaz dynasty" without substantive details about what they were or why they mattered. To write an accurate 2-sentence overview, I would need to invent facts beyond what's given, which violates your instructions.
AI-generated from the Wikipedia summary — may contain errors.
via Wikipedia infobox
The Abbasid dynasty, or Abbasids, (Arabic: بنو العباس, romanized: Banu al-ʿAbbās) was an Arab dynasty that ruled the third Islamic caliphate between 750 and 1258. They were from the Qurayshi Hashimid clan of Banu Abbas, descended from Abbas ibn Abd al-Muttalib. The Abbasid Caliphate is divided into three main periods: Early Abbasid era (750–861), Middle Abbasid era (861–936) and Later Abbasid era (936–1258). A cadet branch of the dynasty also ruled as ceremonial rulers for the Mamluk Sultanate (1261–1517) until their conquest by the Ottoman Empire.
Ancestry
Discovered by embedding cosine similarity (sentence-transformers MiniLM, 384-dim).