I should add that the French term "la belle mort" figures prominently in The Ancient Greek Hero in 24 Hours, https://chs.harvard.edu/CHS/article/display/5947.part-i-hour-5-when-mortals-become-‘equal’-to-immortals-death-of-a-hero-death-of-a-bridegroom,
as for example at the paragraph that you find at 5§108.