With the repreieve provided by the Treaty of Hudaybiyya, Prophet Muhammad can focus on spreading Islam by doing dawah to surrounding leaders. This lecture covers encounters with two prominent leaders:
1. The Abysinnian king Najashi, who converted to Islam
2. The Roman emperor Heraclius, who questioned Abu Sufyan and acertained Prophet Muhammad's legitimacy, but did not openly convert
Lecture notes available at http://www.why-quran.org/?p=624.
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Video recording of this lecture + Q&A available on YouTube at https://www.youtube.com/watch?v=FqptIDOW2fU&list=PLpkB0iwLgfTat-Pgh4W3WFmupPamiC9UT.