Just wondering why it seems like the thought of having an heir didn't cross his mind. And I'm curious about his plans for succession before his last days; it seems hard to believe that what's in his last will was his plan all along.
Edit: turns out some form of this question has been asked dozens of times (that's what you get when you don't search around properly before posting). I think I've read all answers, so I'd like to stress two topics that don't seem to have been answered:
Hi, this question has come up here several times, but while I don't recall anyone addressing the concept of hereditary leadership, here's a recentish answer by /u/DerProfessor that can get you started: