"Haddest hold upon" can be replaced by several synonyms such as "had a firm grip on", "maintained a tight grasp on", "had complete control over", or "exerted a strong influence on". These phrases refer to a situation where someone has a powerful hold over something or someone, be it physically or emotionally. The phrase can also be expressed as "had a stranglehold on", "kept a tight rein on" or "had a vice-like grip on". These expressions convey the idea that the subject is dominating and controlling, often to an excessive degree. Overall, the synonyms for "haddest hold upon" differ in nuance but share the common element of a strong, unyielding grip on something.