== Avvakum vs Abbacum == 

 Avvakum is much more used in English scholarship. http://scholar.google.com/scholar?hl=en&c2coff;=1&safe;=off&q;=Avvakum&spell;=1 gives 330 hits, while http://scholar.google.com/scholar?hl=en&lr;=&safe;=off&c2coff;=1&q;=Abbacum&btnG;=Search gives none and http://scholar.google.com/scholar?hl=en&lr;=&safe;=off&c2coff;=1&q;=Abbakum&btnG;=Search gives one unrelated. imilarly http://www.google.com.au/books?lr=&q;=Avvakum&btnG;=Search+Books&as;_brr=0 gives 1320 hits, while http://www.google.com.au/books?lr=&q;=Abbacum&btnG;=Search+Books&as;_brr=0 yeilds 35 (mostly intelated). Thus, I have returned the title to Avvakum