Pliny the Younger (AD61–AD112) to his wife, Calpurnia

You will not believe what a longing for you possesses me. The chief cause of this is my love; and then we have not grown used to be apart. So it comes to pass that I lie awake a great part of the night, thinking of you; and that by day, when the hours return at which I was wont to visit you, my feet take me, as it is so truly said, to your chamber, but not finding you there I return, sick and sad at heart, like an excluded lover