The phrase "haddest authority" consists of two parts: "haddest" and "authority".
1. "Haddest" is the second person singular past tense of the verb "to have" in Middle English. It is derived from the Old English word "hæfde". "Haddest" refers to the act of possessing or owning something in the past.
2. "Authority" comes from the Latin word "auctoritas", which means "influence" or "command". It entered Middle English through Old French in the 13th century. "Authority" refers to the power or right to give commands, make decisions, or enforce obedience.
Therefore, the word "haddest authority" is a combination of the past tense form of the verb "to have" and the noun "authority". It is used to express the possession of power or control in the past.