Halcyon days.

“Halcyon days” is an idiomatic phrase for a period of calm, prosperity, or idyllic happiness. In classical Greek usage it alludes to the myth of Alcyone (Halcyon), whose transformation into a kingfisher was said to bring a brief spell of tranquil weather for nesting—hence “halcyon” as a metaphor for peace and ease. Attributed to Aristophanes, the phrase would function as a compact poetic shorthand for a wished-for respite from turmoil (political, social, or personal), a meaning that later English inherits. Without a verified passage, however, it is best read as a general classical allusion rather than a securely locatable Aristophanic line.