In the peaceful latter part of the 600s, Theodore, who had been a monk in Rome, was appointed archbishop and visited all the island speaking about the right rule of life and ordaining bishops to oversee the priests. Each kingdom was split up into dioceses each with one bishop. Thereafter, bishops were selected by the king and his witan, usually after consulting the clergy and even the people of the diocese. The bishops came to be the most permanent element of society. They had their sees in villages or rural monasteries. The bishops came to have the same wergeld as an eorldorman: 1200s., which was the price of about 500 oxen. A priest had the wergeld as a landholding farmer [thegn], or 300s. The bishops spoke Latin, but the priests of the local parishes spoke English. Theodore was the first archbishop whom all the English church obeyed. He taught sacred and secular literature, the books of holy writ, ecclesiastical poetry, astronomy, arithmetic, and sacred music. Theodore discouraged slavery by denying Christian burial to the kidnapper and forbidding the sale of children over the age of seven. A slave became entitled to two loaves a day and to his holydays. A slave was allowed to buy his or his children's freedom. In 673, Theodore started annual national ecclesiastical assemblies, for instance for the witnessing of important actions. The bishops, some abbots, the king, and the eorldormen were usually present. From them the people learned the benefit of common national action. There were two archbishops: one of Canterbury in the south and one of York in the north. They governed the bishops and could meet with them to issue canons that would be equally valid all over the land. A bishop's house contained some clerks, priests, monks, and nun and was a retreat for the weary missionary and a school for the young. The bishop had a deacon who acted as a secretary and companion in travel, and sometimes as an interpreter. Ink was made from the outer husks of walnuts steeped in vinegar. The learned ecclesiastical life flourished in monastic communities, in which both monks and nuns lived. Hilda, a noble's daughter, became the first nun in Northumbria and abbess of one of its monasteries. There she taught justice, piety, chastity, peace, and charity. Several monks taught there later became bishops. Kings and princes often asked her advice. Many abbesses came to run monastic communities; they were from royal families. Women, especially from royal families, fled to monasteries to obtain shelter from unwanted marriage or to avoid their husbands. Kings and eorldormen retired to them.