How authentic are the narrations that speak of Al-Walid ibn Yazid’s consumption of alcohol and sodomy, and his attempt to solicit his brother Sulayman, as well as what was mentioned about Muhammad al-Amin and his request for eunuchs and his rejection of women?

Firstly, tracing the historical sources that speak of al-Walid ibn Yazid being accused of sodomy: What Ibn Sa'd narrated from al-Zuhri is not suitable as proof due to the unknown reliability and justice of the one who informed al-Zuhri. What al-Tabari narrated from Sulaiman, al-Walid's brother, is not suitable as proof due to the weakness of its chain of narration, and the fact that Sulaiman was an enemy of al-Walid, in addition to al-Walid's concubine denying this accusation and accusing Sulaiman of lying. What was narrated from al-Walid himself, denying committing indecencies, supports the incorrectness of the accusations made against him. These historical accounts are not legal evidence to prove sins, and Sharia rulings require strong evidence.

Secondly, the accusation against Caliph al-Amin is weaker than the previous one: Al-Tabari presented it without a chain of narration from Humayd ibn Sa'id. There is no explicit statement of indecency in the narration. The narration contradicts al-Amin's biography of having a wife and child, his grief over his concubine who was the mother of his child, and his disapproval of Abu Nuwas's poetry. What he was known for in terms of amusement might have made it easy for his opponents to accuse him during a time of struggle for kingship. Even if these accusations were true, they are individual sins that the Ummah does not bear, and they cannot be used to discredit all other caliphs.

In conclusion, the accusations made against both are weak in terms of their chain of narration and text, and those historical accounts are not legal evidence to prove sins.