King Ziaelas of Bithynia replies to an embassy from Cos: he recognizes the inviolability (asylia) of the sanctuary of Asclepius and undertakes to befriend the city, recalling the goodwill of his father Nicomedes I, the city's long acquaintance with Bithynia, and his own alliance with king Ptolemy (III). He promises to look after the security of Coan and Greek seafarers who put in at Bithynian-controlled ports, and to see that any who suffer mishap at sea are wronged by no one. The only royal letter of a Bithynian king in Welles; part of the Coan asylia dossier (Welles 25–28). c.240 BCE.比提尼亚王齐阿埃拉斯答复科斯之使团：承认阿斯克勒庇俄斯圣域之不可侵犯（asylia），并允诺善待该城，追述其父尼科墨德斯一世之善意、该城与比提尼亚之久谊，及其本人与托勒密（三世）之同盟。其许诺照护停泊于比提尼亚所控港口之科斯与希腊航海者之安全，并使海上罹难者不受任何人之侵害。乃 Welles 中唯一比提尼亚王之书信；属科斯不可侵犯文书（Welles 25–28）。约公元前240年。