All these, however, were mere terrors of the night, phantoms of the mind that walk in darkness; and though he had seen many spectres in his time, and been more than once beset by Satan in divers shapes, in his lonely pre-ambulations, yet daylight put an end to all these evils; and he would have passed a pleasent life of it, in despite of the devil and all his works, if his path had not been crossed by a being that causes more perplexity to mortal man than ghosts, goblins, and the whole race of witches put together, and that was - a woman.

The letters brought Irving some early fame and moderate notoriety. His portrait appeared on the bank's notes and contributed to their wide appeal. He made his literary debut in 1802 with a series of observational letters to the Morning Chronicle written under the pseudonym Jonathan Oldstyle.

His historical works include biographies of George Washington Oliver Goldsmith and Muhammad and several histories of 15th-century Spain dealing with subjects such as Christopher Columbus the Moors and the Alhambra. He continued to publish regularly—and almost always successfully—throughout his life and completed a five-volume biography of George Washington just eight months before his death at age 76 in Tarrytown New York.