Law of 20 May 1802
The French Law of 20 May 1802 was passed that day ( 30 floréal year X ) , revoking the Law of 4 February 1794 ( 16 pluviôse ) which had abolished slavery in all the French colonies . 
<triplet> Law of 20 May 1802 <subj> 20 May 1802 <obj> publication date