in his reign he reversed all his father's laws and stopped taxes for poorer people, repealed (got rid of) the anti-jewish laws and stopped public executions. his father, cosimo iii, wanted the his sister to succeed him but spain, great britain, austria and the dutch republic disregarded and made charles iii of spain his heir. charles changed his claim to francis iii of lorraine. francis then became the grand duke on 9 july 1737 ending almost 300 years of medici rule over florence.