Misc: Whose daughter became the wealthiest three year old in 1988?

Questions

Which French mathematician, "the father of Modem Mathematics", invented analytical or co-ordinate geometry?

Whose epitaph reads "He snatched the lightning from the skies and the sceptre from tyrants"?

Xizang (spelt X-I-Z-A-N-G) is now a province of China. What is its other name?

Which word comes from the Roman "where three roads meet" as a place where messages were left?

In which city will you find the epitaph "Rest in peace, the mistake shall not be repeated"?