This study aims to analyze Hasan di Tiro's role in Aceh's peace diplomacy during 2005–2010 from the perspective of Alexander Wendt's constructivist theory. This study employed a qualitative approach using a descriptive-analytical method, the study relied on primary data collected through interviews and documentation, as well as secondary data obtained from a literature review. The data were subsequently analyzed using the interactive analysis model developed by Miles, Huberman, and Saldaña, which comprises three stages: data reduction, data display, and conclusion drawing. The findings indicate that Hasan di Tiro played an important role in legitimizing the Helsinki Peace Agreement, encouraging the transformation of GAM from armed resistance to political engagement, and serving as a symbol of reconciliation in sustaining peace in Aceh. From Wendt's constructivist perspective, this transformation resulted from changes in identity, interests, and norms through interactions among GAM, the Government of Indonesia, and international mediators. The study concludes that Hasan di Tiro's transformation was a key factor in the success of Aceh's peace diplomacy.
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