Question:
Who was the head of Romania in Jul, 1865?

Context:
 Ion G. Duca is the head of the government of Romania from Nov, 1933 to Dec, 1933. 
 Mihai Răzvan Ungureanu is the head of the government of Romania from Feb, 2012 to May, 2012. 
 Chivu Stoica is the head of the government of Romania from Oct, 1955 to Mar, 1961. 
 Theodor Stolojan is the head of the government of Romania from Oct, 1991 to Nov, 1992. 
 Nicolae Iorga is the head of the government of Romania from Apr, 1931 to Jun, 1932. 
 Mugur Isărescu is the head of the government of Romania from Dec, 1999 to Dec, 2000. 
 Petre Roman is the head of the government of Romania from Dec, 1989 to Oct, 1991. 
 Manea Mănescu is the head of the government of Romania from Feb, 1974 to Mar, 1979. 
 Viorica Dăncilă is the head of the government of Romania from Jan, 2018 to Nov, 2019. 
 Ion C. Brătianu is the head of the government of Romania from Jun, 1881 to Mar, 1888. 
 Manolache Costache Epureanu is the head of the government of Romania from May, 1876 to Aug, 1876. 
 Ion Gigurtu is the head of the government of Romania from Jul, 1940 to Sep, 1940. 
 Dimitrie Ghica is the head of the government of Romania from Nov, 1868 to Jan, 1870. 
 Constantin Dăscălescu is the head of the government of Romania from May, 1982 to Dec, 1989. 
 Constantin Sănătescu is the head of the government of Romania from Aug, 1944 to Dec, 1944. 
 Ștefan Golescu is the head of the government of Romania from Nov, 1867 to May, 1868. 
 Take Ionescu is the head of the government of Romania from Dec, 1921 to Jan, 1922. 
 Theodor Rosetti is the head of the government of Romania from Mar, 1888 to Mar, 1889. 
 Nicolae Golescu is the head of the government of Romania from May, 1868 to Nov, 1868. 
 Ion Gheorghe Maurer is the head of the government of Romania from Mar, 1961 to Feb, 1974. 
 Dacian Cioloș is the head of the government of Romania from Nov, 2015 to Jan, 2017. 
 Ion Emanuel Florescu is the head of the government of Romania from Mar, 1891 to Dec, 1891. 
 Constantin Bosianu is the head of the government of Romania from Jan, 1865 to Jun, 1865. 
 Călin Popescu-Tăriceanu is the head of the government of Romania from Dec, 2004 to Dec, 2008. 
 Sorin Grindeanu is the head of the government of Romania from Jan, 2017 to Jun, 2017. 
 Octavian Goga is the head of the government of Romania from Dec, 1937 to Feb, 1938. 
 Nicolae Rădescu is the head of the government of Romania from Dec, 1944 to Feb, 1945. 
 Victor Ponta is the head of the government of Romania from May, 2012 to Nov, 2015. 
 Dimitrie Sturdza is the head of the government of Romania from Apr, 1897 to Apr, 1899. 
 Gheorghe Tătărescu is the head of the government of Romania from Jan, 1934 to Dec, 1937. 
 Ilie Verdeț is the head of the government of Romania from Mar, 1979 to May, 1982. 
 Mihai Tudose is the head of the government of Romania from Jun, 2017 to Jan, 2018. 
 Mihail Kogălniceanu is the head of the government of Romania from Oct, 1863 to Jan, 1865. 
 Alexandru G. Golescu is the head of the government of Romania from Feb, 1870 to Apr, 1870. 
 Petre S. Aurelian is the head of the government of Romania from Dec, 1896 to Apr, 1897. 
 Armand Călinescu is the head of the government of Romania from Mar, 1939 to Sep, 1939. 
 Gheorghe Gheorghiu-Dej is the head of the government of Romania from Jun, 1952 to Oct, 1955. 
 Barbu Catargiu is the head of the government of Romania from Feb, 1862 to Jun, 1862. 
 Radu Vasile is the head of the government of Romania from Apr, 1998 to Dec, 1999. 
 Emil Boc is the head of the government of Romania from Dec, 2008 to Feb, 2012. 
 Florin Cîțu is the head of the government of Romania from Dec, 2020 to Nov, 2021. 
 Victor Ciorbea is the head of the government of Romania from Dec, 1996 to Apr, 1998. 
 Dimitrie Brătianu is the head of the government of Romania from Apr, 1881 to Jun, 1881. 
 Constantin Argetoianu is the head of the government of Romania from Sep, 1939 to Nov, 1939. 
 Ion Ghica is the head of the government of Romania from Dec, 1870 to Mar, 1871. 
 Petru Groza is the head of the government of Romania from Mar, 1945 to Jun, 1952. 
 Miron Cristea is the head of the government of Romania from Feb, 1938 to Mar, 1939. 
 Ludovic Orban is the head of the government of Romania from Nov, 2019 to Dec, 2020. 
 Adrian Năstase is the head of the government of Romania from Dec, 2000 to Dec, 2004. 
 Nicolae Văcăroiu is the head of the government of Romania from Nov, 1992 to Dec, 1996. 
 Nicolae Crețulescu is the head of the government of Romania from Jun, 1865 to Feb, 1866. 
 Lascăr Catargi is the head of the government of Romania from Dec, 1891 to Oct, 1895. 
 Nicolae Ciucă is the head of the government of Romania from Nov, 2021 to Dec, 2022. 
 Gheorghe Argeșanu is the head of the government of Romania from Sep, 1939 to Sep, 1939.

Answer:
Nicolae Crețulescu