This paper attempts to integrate the literatures on authoritarian regime types and democratic forms of government. Based on different modes of executive appointment and dismissal, I propose a parsimonious theory of five regime dimensions that cut across the democracy/autocracy divide: the hereditary principle; the military principle; the ruling party principle; the presidential and the parliamentary principles, respectively. Relying on the Varieties of Democracy data, I provide alternative measures of these five regime dimensions for 173 countries across the globe from 1900 to today. A plausibility probe gauges the extent to which the five dimensions can predict the level of repression, rent-seeking and spending on public goods across space...