We use large samples of estate tax returns to construct new series on wealth concentration in Paris and France from 1807 to 1994. Wealth concentration in Paris and in France increased until World War I and then fell abruptly. The rise in inequality prior to WWI accelerated (rather than stabilized) during the 1860-1913 period. This was largely driven by the growth of large industrial and financial estates and coincided with the decline of aristocratic fortunes (until 1857, the share of aristocrats and real estate in top estates was actually rising). The decline in wealth concentration that followed World War I appears to have been prompted by the 1914-1945 shocks rather than by a two-sector, Kuznets-type process. Inequality fell both in Pari...