'In her hand was a signet ring, heavy gold and worn with age, almost large enough for both her thumbs to fit through. On it, a crane flew above a lance and crown, all carefully wrought in detail. Her breath caught. The ring of Malkieri kings. Forgetting to glare, she lifted her face. “I cannot take this, Lan.” He shrugged in an offhand way. “It is nothing. Old, and useless, now. But there are those who would know it when they saw it. Show that, and you will have guestright, and help if you need it, from any lord in the Borderlands. Show it to a Warder, and he will give aid, or carry a message to me. Send it to me, or a message marked with it, and I will come to you, without delay and without fail. This I swear.”' - Chapter 8 of The Great Hunt
The Wheel of Time | 3.01 To Race the Shadow