The Renaissance began in 14th century Italy and spread across Europe over time. Key developments included greater emphasis on secular and humanist ideas, advances in painting like realistic depictions and use of perspective, and highly realistic sculptures. Scientists like Leonardo da Vinci began making detailed observations and experiments, questioning established ideas. Politically, powerful rulers like the Medicis in Florence held power for a long time through building armies, sponsoring the arts, and defeating enemies, until being temporarily ousted, after which Machiavelli's The Prince analyzed realpolitik.