Solar Energetic Events and Volcano Cycles 1257 and 1279 The Rinjani Super Volcano

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https://www.pnas.org/content/110/42/16742

Source of the great A.D. 1257 mystery eruption unveiled, Samalas volcano, Rinjani Volcanic Complex, Indonesia

22 years later, a "full" solar cycle, in 1279 another Solar Energetic Event was logged.

https://www.researchgate.net/publication/348214780_Eleven-year_solar_cycles_over_the_last_millennium_revealed_by_radiocarbon_in_tree_rings

LOL This trekking website downplays the Risk around Rinjani complex.

<a href="https://www.rinjanidawnadventures.com/mount-rinjani/" target="_blank">https://www.rinjanidawnadventures.com/mount-rinjani/</a>

A 1256 Volcano also produced a significant eruption, in Saudi Arabia, at harrat Rahat.   Which also went off in 641 CE (AD).   In 1256 the lava travelled almost a full marathon, and threatened the Islamic Holy City of Medina.    The 641 Eruption was  one solar cycle after the Death of Muhammad in 6-8-632.    Muhammad died in Medina one solar cycle after be forced out elsewhere, and he and disciples had to move to Medina.   

https://www.britannica.com/biography/Muhammad