It is generally thought that the codices were constructed during Alfonso's lifetime, To perhaps in the 1270s, and T/F and E in the early 1280s up until the time of his death in 1284.
Smatra se da su kodeksi stvoreni tokom Alfonsovog života, To možda u 1270im, T, F i E u ranim 1280im sve do njegove smrti 1284.