据说乾隆三十九年(公元1774年)弘历皇帝在纪晓岚的陪同下曾驾幸此山，饱览胜境，龙心大悦，遂降旨将星子山赐名为星德山，御笔题写“南天门”匾额，并从道家经典《淮南子、天文训》中以摘集文句的形式、叠字顶针的手法，御赐了以“惟道独尊”为横批的“道生一，一生二，二生三，三生万物;人法地，地法天，天法道，道法自然”的道观楹联，紫气东来三万里，函关初度五千年，致使“灵毓星峰，胜境都成仙世界;脉延雷岳，佳城永镇古山川”。
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