The case of RamalakshmiAmmal v. Sivanantha Perumal Sethurayar (1871-72) established the significance of special usages in modifying the conventional laws of succession. It emphasized that these usages must demonstrate a history of ancient and consistent application. Moreover, their establishment as such requires clear and unequivocal evidence. Such evidence is vital for the courts to ascertain their existence, antiquity, and certainty, which are essential criteria for their legal recognition.