He had, in vain, tried to persuade kings Gustav Vasa and Eric to be allowed to publish a complete church ordinance.
Through the ordinance, all the fundamental Lutheran doctrines were written down and Catholic canon law formally lost its authority.
He altered the Catholic doctrines he believed were incompatible with true Christianity, but allowed others to remain if he deemed them useful.
Petri planned on writing a declaration statement to the Augsburg Confession, but died shortly after, and the issue was not settled until the Uppsala Synod, 1593.
[5] This ordinance was also altered by King John III of Sweden, who made several Catholic-inclined additions to it: the Nova Ordinantia of 1575, and his own church doctrine, the Röda boken ('Red Book') of 1576, two additions which introduced a middle stance between Catholicism and Protestantism, and reintroduced many Catholic customs.