Citizens for European Development of Bulgaria (Bulgarian: Граждани за европейско развитие на България Grazhdani za evropeysko razvitie na Balgariya) abbreviated GERB (Bulgarian: ГЕРБ the word герб which is ГЕРБ spelled lowercase meaning coat of arms) is a Bulgarian conservative political party established on March 13 2006.GERB is headed by Boyko Borisov a former Prime Minister of Bulgaria former mayor of Sofia and former member of the National Movement Simeon II.