Have the Bourbon Dynasty after the Restoration in France (thus after the Napoleonic Wars) last as long as possible, preferrably until the present day. Bonus points if the Orleans don't come to power, even though they technically count as Bourbons. More bonus points for continous rule...
((With apoligies to Othniel and DominusNovus))
((With apoligies to Othniel and DominusNovus))