Hiatus was common in Old Spanish, except when the first of two words was the definite article, a personal pronoun-object or the preposition de; or when the vowels were the same.
(b) Hiatus is usual when the initial vowel of the second word has a strong accent (usually the rhythmic accent at the end of a line or phrase):
Pues | en | fin | me | de|jó | una (Calderón).
Ta|les | fue|ron | ya | és|tos | cual | her|mo|so (Herrera).
Tal | de | lo | al|to | tem|pes|tad | des|he|cha (Maury).
No hay | pla|ce|res | en | su | al | ma.
Cuan|do | po|bre | de | a|ños | y | pe|sa|res
Con|ti|go | se | fué | mi | hon|ra.