A referendum on Prince Karl Ludwig of Hohenzollern-Sigmaringen becoming ruling prince was held in Romania on 20 April 1866.[1] The proposal was approved by 99.97% of the votes cast, and Prince Karl Ludwig was subsequently enthroned as Domnitor with the regnal name Carol I on 23 October. His title was later raised to King of Romania in 1881.[1]
Results
| Choice
 | 
Votes
 | 
%
 | 
| For | 
685,969 | 
99.97
 | 
| Against | 
224 | 
0.03
 | 
| Invalid/blank votes | 
 | 
–
 | 
| Total | 
686,193 | 
100
 | 
| Registered voters/turnout | 
811,030 | 
84.60
 | 
| Source: Direct Democracy
 | 
References