365958
Cellach 's brother Muiredach ruled as co-king with Muiredach mac Ruadrach ( died 829 ) of the Uí Fáeláin sept from 808 to 818 .
 Cellach, Muiredach, Muiredach mac Ruadrach
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Cellach, Muiredach, Muiredach mac Ruadrach