Magna Carta emerged from a crisis of royal authority, fiscal pressure, and baronial revolt in the years after King John’s losses in France and his disputes with the Church. The charter’s production and sealing were collective acts whose authority depended on the composition of witnesses and guarantors; the witness lists therefore functioned as a public index of political legitimacy and mediation in 1215. The 1215 text is a compact set of concessions addressing feudal rights, royal abuses, and procedures for justice; clauses such as those guaranteeing lawful judgement and access to justice became touchstones for later legal traditions. The surviving exemplifications and modern diplomatic editions allow close reading of the clauses and the names appended to them, showing how the document combined ecclesiastical, baronial and royal interests into a negotiated settlement. The Templars at that time were a transnational military/monastic order with substantial landed wealth and political connections in England. Brother Aymeric (Aimeric de St Maur) is explicitly named among the “venerable fathers” who advised King John, and contemporary accounts and later institutional memory place the Master of the Templars in England within the circle that prepared and witnessed the charter. This presence reflected the Order’s role as a major landholder, financier and political actor rather than as a legal drafting body: the Templars’ influence derived from patronage networks, counsel to magnates, and their institutional prestige. Key lay mediators such as William Marshal, Earl of Pembroke, worked alongside ecclesiastical figures (notably Archbishop Stephen Langton) to broker the settlement; Marshal’s later association with the Temple Church and his burial there underline the close social ties between leading barons and the Templar establishment in London. The Temple Church and its elite funerary culture symbolised the Order’s position within English aristocratic politics at the time of Magna Carta. Modern scholarship treats the Templars’ role as contextual and facilitative: they appear in the documentary record as advisors and witnesses, not as principal authors of constitutional doctrine. Historians emphasise the charter’s baronial origins and the centrality of local feudal grievances, while acknowledging that institutions like the Templars provided crucial mediation, resources and legitimacy in a fractured polity. OSMTH (England) recognises the original Order’s role in institutional identity and heritage. The Knights Templar at Magna Carta should be understood as powerful intermediaries whose social, financial and spiritual capital shaped the political environment in which the charter was negotiated. Their presence at Runnymede confirms the Order’s integration into English elite politics, but the charter’s legal content and authorship remain rooted in baronial pressure and ecclesiastical mediation rather than in any single institutional authorship.