The Sidur is based on six manuscripts from the 14th-16th centuries and constitutes the recovery of the ancient Nusach Catalunya, the nusach of the Tefillah used by the Jews in Catalonia, Valencia and Mallorca during the Middle Ages (at the time known as the Rishonim period). The Sidur also includes commentaries, halachot and minhaguim that were compiled by a disciple of Rabbenu Yona Girondi at the Bet Midrash of Barcelona.