Riḍā assigns to Persian heretics a plan to destroy Arab rule and to Turks the destruction of Arab civilization. He invokes two reports attributed to Muhammad to frame Turks as a danger to his community. The shorter formula appears in Sunan Abī Dāwūd 4302, while the expanded Banū Qanṭūrā formula circulates through reports attributed to al-Ṭabarānī. These comparisons establish a source tradition for Riḍā's quotations, not the truth of the prophecies or his ethnic and political reading. His accusations remain sweeping judgments, not evidence of one purpose shared by Persian or Turkish peoples. The page turns to Tatar conquest and claims that Persian officials stripped Abbasid caliphs of power; its final sentence continues on p. 462.
Modern work confirms a narrower institutional change. Al-Muʿtaṣim expanded the acquisition of Turkish soldiers, relied on them as a central military force, and settled them with the court at Samarra. The policy probably began under al-Maʾmūn, and Turkish soldiers had served earlier caliphs. This supports Riḍā's identification of al-Muʿtaṣim as a major turning point. It does not support his description of a whole people as savage or make Turkish ethnicity itself an explanation for the later loss of caliphal control.
The Barmakid episode has a firm historical core and a weak ethnic explanation. Encyclopaedia Iranica records about seventeen years of Barmakid influence followed by their fall in January 803. It also rejects as unsustainable the accusation that they definitely supported Persian heterodoxy and gives Khorasanian court interests as a narrower possible explanation. Riḍā's conspiracy framework is not supported by this source.
The Fatimid chronology is broadly right, while Riḍā's ethnic label is not established. The state arose in Ifriqiya in 909, conquered Egypt in 969, and moved its seat there in 973. Its Ismaʿili mission remained active across many regions and rivaled the Abbasids, but there were no extended direct military encounters between the two caliphates. The source does not support calling the state wholly Arab simply because its seat was in Egypt.
The 1258 conquest check supports the violent historical core but not Riḍā's ethnic chain. Encyclopaedia Iranica describes Hülegü's Mongol capture of Baghdad as a major rupture with extensive killing and destruction. That does not establish that the Mongols were advance agents or simple ethnic kinsmen of all Turks, or that later Turkish rule formed one continuous project with the conquest.
The claim that Persian rulers stripped Abbasid caliphs of governing power can be tied to a specific dynasty and date. The Buyid prince Aḥmad ibn Būya entered Baghdad in 945, became amīr al-umarāʾ, and directed a protectorate in which the Sunni caliph lacked governing power. He also replaced al-Mustakfī with another Abbasid caliph. This supports Riḍā's institutional point for the Buyid period, but not his transfer of that conduct to Persians as a whole or his claim of one continuous ethnic design.
The Shuʿūbiyya does not supply the unified Persian religious conspiracy that Riḍā assigns to it. Scholarship describes a varied literary and cultural movement among non-Arab Muslims and other urban groups, with arguments about status, language, court culture, and the place of Persian traditions in Abbasid society. Some participants promoted Persian models, but the movement cannot be reduced to one Zoroastrian plan to restore a Persian state.