This contribution charts a new pathway in the correspondence between Aeneas Silvius Piccolomini (1405–64) and Juan de Carvajal (1399?–1469) by focusing primarily on the relationship between the two men. It argues that each sought to adjust their relationship to fit the political demands of the moment, and that they used it, or tried to use it, as a tool to navigate and even resolve the conciliar crisis. This article enriches our understanding of a critical moment in church history, sharpens our grasp of the roles of both Piccolomini and Carvajal, and suggests new ways that humanism contributed to the fifteenth-century church.

Los investigadores deben citar este trabajo de la siguiente manera:

• O’Brien, E., (2025), "Letters of Alliance and an Alliance of Letters: Aeneas Silvius Piccolomini, Juan de Carvajal, and the Conciliar Crisis", HSSCommons: (DOI: )

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1. Renaissance and Reformation

Original publication: O’Brien, Emily. "Letters of Alliance and an Alliance of Letters: Aeneas Silvius Piccolomini, Juan de Carvajal, and the Conciliar Crisis." Renaissance and Reformation 42 (3): 2019. 73-103. DOI: 10.7202/1066360ar. This material has been re-published in an unmodified form on the Canadian HSS Commons with the permission of Iter Canada / Renaissance and Reformation. Copyright © the author(s). Their work is distributed by Renaissance and Reformation under a Creative Commons Attribution-NonCommercial 4.0 International License. For details, see https://creativecommons.org/licenses/.