message: Parthenon gives +50% great people birth rate in all cities
diff: <MaxStartEra>ERA_CLASSICAL</MaxStartEra>
  <PrereqTech>TECH_MATHEMATICS</PrereqTech>
  <ObsoleteTech>TECH_GUNPOWDER</ObsoleteTech>
  - <CivicOption>CIVICOPTION_LEGITIMACY</CivicOption>
  <GreatPeopleUnitClass>UNITCLASS_GREAT_ARTIST</GreatPeopleUnitClass>
  <iGreatPeopleRateChange>2</iGreatPeopleRateChange>
  <bTeamShare>1</bTeamShare>
  <iAdvancedStartCost>-1</iAdvancedStartCost>
  <iMinAreaSize>-1</iMinAreaSize>
  <iConquestProb>100</iConquestProb>
  + <iGlobalGreatPeopleRateModifier>50</iGlobalGreatPeopleRateModifier>
  <iAsset>10</iAsset>
  <fVisibilityPriority>1.0</fVisibilityPriority>
  <ObsoleteSafeCommerceChanges>
  