公元十三世纪中叶，蒙古大军逼近保加利亚第二帝国，帝国统治式微，并于1277年爆发了伊瓦伊洛领导的农民起义。1278年伊瓦伊洛攻占首都第诺伐，自封为保加利亚沙皇，1279年东罗马帝国军队攻占第诺伐，伊瓦伊洛被迫逃亡，次年被蒙古人所杀

A documentary about the BBC Radiophonic Workshop, responsible for creating some of the most memorable television and radio music in British popular culture, including "The Hitchhiker's Guide to the Galaxy" and Doctor Who (1963).