PERSON@1 -LRB- September NUMBER@1 , NUMBER@2 -- January NUMBER@1 , NUMBER@3 -RRB- was a MISC@1 author of books on political philosophy , natural science and his posthumous father-in-law PERSON@2 .

PERSON@3 -LRB- September NUMBER@4 - January NUMBER@1 , NUMBER@3 -RRB- was a writer of books .
