The earliest siddur I own (London, 5569 [18808-09]) does not include Ketoret or Akeidah, despite purporting to follow the customs of the "German and Polish" communities [emphasis mine]. Since most of the eastern Ashkenazi siddurim I've seen have both of these portions, as well as gemara excerpts before Zevachim 5, I have wondered when they were added. Is there any documentation, such as old siddurim or writings of Acharonim, which points to an origin of the usage of these passages in birchot hashachar?
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