When did Lord Byron travel to Persia and did he write a travel writing about that?

It is extremely difficult to depict Lord Byron, and even
presumptuous to attempt it. This is not only because he is a familiar subject, the
triumphs and sorrows of whose career have been often portrayed, but also because he
presents so many contradictions in his life and character,--lofty yet degraded, earnest
yet frivolous, an impersonation of noble deeds and sentiments, and also of almost every
frailty which Christianity and humanity alike condemn. No great man has been more
extravagantly admired, and none more bitterly assailed; but generally he is regarded as
a fallen star,--a man with splendid gifts which he wasted, for whom pity is the
predominant sentiment in broad and generous minds. With all his faults, the
English-speaking people are proud of him as one of the greatest lights in our
literature; and in view of the brilliancy of his literary career his own nation in
particular does not like to have his defects and vices dwelt upon. It blushes and
condones. It would fain blot out his life and much of his poetry if, without them, it
could preserve the best and grandest of his writings,--that ill-disguised autobiography
which goes by the name of "Childe Harold's Pilgrimage," in which he soars to loftier
flights than any English poet from Milton to his own time. Like Shakespeare, like
Dryden, like Pope, like Burns, he was a born poet; while most of the other poets,
however eminent and excellent, were simply made,--made by study and labor on a basis of
talent, rather than exalted by native genius as he was, speaking out what he could not
help, and revelling in the richness of unconscious gifts, whether for good or
evil.