The phrase "hadst right to" can be replaced by several different synonyms, depending on the intended meaning. For instance, one could use the phrase "were entitled to" to convey the idea of having a legitimate claim or privilege. Another possible synonym is "had a just claim to," which emphasizes the fairness or validity of the claim in question. A third option might be "had the authority to," which suggests that the individual in question had the power or right to make a particular decision or take a certain action. Ultimately, the choice of synonym will depend on the context and the speaker's intended meaning.