Halcyon – calm, quiet, peaceful, undisturbed, happy; a number of days occurring about the winter solstice, when the weather is calm; hence, days of peace and tranquility

“After this and other political atrocities, the legislative body was labeled the most corrupt since the halcyon days of Boss Tweed and his henchmen, who bilked the city out of tens of millions of dollars.”

Lion in the white house, Aida D. Donald