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After Diocletian retired, the tetrarchy basically fell apart. He came our of retirement to stabilize it again but it just did not work and fell apart again. How can we make the tetrarchy survive at least another 100 years? What would be the effects of that?

Could Maximian dying before Diocletian retires, or right after they both retire help? He never really wanted to retire and caused problems after his retirement.
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