The Act of Settlement 1703 is a foundational Manx constitutional and property law document passed by Tynwald Court. It codifies the relationship between the Earl of Derby (Lord of Mann) and his tenants, establishing customary estates of inheritance, standardising fines on descent and alienation, and resolving long-standing disputes over tenancy terms. The act also addresses cottages, intacks, mortgages, and quarries. This document is central to understanding Manx landholding law, feudal relations, and governance structures before the 1765 Revestment.