<span style="line-height: 115%; font-family: 'Times New Roman','serif'; font-size: 12pt; mso-ansi-language: EN-GB; mso-fareast-font-family: 'MS Mincho'; mso-fareast-language: PL; mso-bidi-language: AR-SA;" lang="EN-GB">This article attempts to examine the problem of friendship as it was understood by Seneca in his letters sent to Lucillus. The author scrutinizes the main items in the philosopher’s autobiography to investigate the influence of the events from Seneca’s biography in the shaping of the opinions of the thinker. Lucillus, the addressee of the letters, was actually Seneca’s long-time friend and confidant. The issue of friendship has a long and rich tradition of its own in the antique times. This particular relationship between hum...