Calderon. So scarce has this first authorised collection of any of
Calderon's dramas become, that a Spanish writer Don Vicente Garcia de
la Huerta, in his "Teatro Espanol" (Parte Segunda, tomo 3o), denies
the existence of this volume of 1635, and states that it did not
appear until 1640. As if to corroborate this view, Barrera in his
"Catalogo del Teatro antiguo Espanol" gives the date 1640 to the
"Primera parte de comedias de Calderon" edited by his brother Joseph.

There can be no doubt, however, that the volume appeared in 1635 or
1636 as stated. In 1637 Don Joseph Calderon published the "Second
Part" of his brother's dramas containing like the former volume
twelve plays.* In his dedication of this volume to D. Rodrigo de
Mendoza, Joseph Calderon expressly alludes to the First Part of his
brother's comedies which he had "printed." "En la primera Parte,
Excellentissimo Senor, de las comedias que imprimi de Don Pedro
Calderon de La Barca, mi hermano," etc. This of course settles the
fact of the prior publication of the first Part. It is singular,
however, to find that the most famous of all Calderon's dramas should
have been frequently ascribed to Lope de Vega. So late as 1857 it is
given in an Italian version by Giovanni La Cecilia, under the title
of "La Vita e un Sogno", as a drama of Lope de Vega, with the date
1628. This of course is a mistake, but Senor Hartzenbusch, who makes
no allusion to this circumstance, admits that two dramas of Lope de
Vega, which it is presumed preceded the composition of Calderon's
play turn on very nearly the same incidents as those of "La Vida es
Sueno". These are "Lo que ha de ser", and "Barlan y Josafa". He
gives a passage from each of these dramas which seem to be the germ
of the fine lament of Sigismund, which the reader will find
translated in the present volume.