The first reference to Strotza, in a letter dated May 31, 1822, on the registration of the auction of the national oil Mistra province of year 1821, where the "Strotza" refers that offers 10,000 kilos of oil.
In the Official Gazette No. . 80 / 12.28.1836 the Strotza belongs to Management Lacedaemon, the municipality Krokeon in Petrina and in 1860 Strotza transferred administratively to the municipality of Melittin, in Agios Nikolaos.
In 1920 Strotza belongs to the province Lacedaemon, in the police station Saint Nicolas vice governship Levetsova Laconia Administration, the county Court Melittin, the Court and the Tax Office in Sparta.
On 03/23/1925 by Presidential Decree detached Rozova from Strotzas community.
A Presidential Decree on 07.19.1928, renamed the Strotza to "Prosilio".
Finally with Law 2539/1997 the Prosilio joined to the municipality Smynos and with law 3852/2010 was incorporated to the municipality East Mani.
The course of the village population shown in the following table:

Year      

Total         

 Men       

Woman

1846

80

   

1851

124

   

1879

211

107

104

1900

257

   

1907

322

157

165

1920

358

166

192

1928

341

158

183

1940

383

169

214

1951

295

   

1971

147

   

1981

80

50

30

1991

104

46

58

2001

168

80

88