Cicero's letters chart the growth of his library through a period of about twenty years, from the height of his public career until almost the end of his life. Combining the evidence in the letters with other sources, we gain a more complete picture of how aristocrats and men of letters at Rome assembled, housed, and used substantial libraries in the first century BC, as well as how those collections might be dispersed. I organize the evidence for acquisitions under the headings of purchases, gifts and inheritances, and miscellaneous acquisitions, then consider two instances of losses suffered by Cicero; I examine Cicero's patterns of library usage and conclude with speculation on the fate of his collection. The earliest references come in four letters of 67–66 BC from Cicero to Atticus, then in Greece. In the first letter, dated before the Ides of February, 67, Cicero says: “Please consider how you can obtain a library for me, just as you promised. All hope of the pleasure which I want to have when I come into some leisure, I have placed in your kindness.” By May, it seems, Atticus had the library in hand, for Cicero says, “Beware of promising your library to anyone, however passionate a lover you find. For I am reserving all my little grape harvests for it, in order to prepare that prop for old age.” Then in August, Cicero writes, “Beware of handing over your books to anyone; save them for me, as you write. The greatest enthusiasm for them holds me, just as disgust for all other things.” Finally, in 66, Cicero says “Save your books and don't despair that I am able to make them mine. If I accomplish that, I will surpass Crassus in riches and I despise the hamlets and meadows of all.”.