My family is from Ischia, Italy and on the coat of arms reads "ISCHIA FIDELITATIS ÆTERNÆ". I would like to get "FIDELITATIS ÆTERNÆ" as a tattoo but I want to make sure it is in the proper form. Would that mean the correct form would be "FIDELITAS ÆTERNA" for it to mean eternal faithfulness / fidelity? Any help would be appreciated. Thank you.