Days of yore is a phrase that refers to a time long ago, often related to historical events or past eras. There are various synonyms that you can use to describe this period, including 'the good old days,' 'olden times,' 'bygone years,' 'ancient times,' 'historical epochs,' 'long ago,' 'former times,' and 'days gone by.' These synonyms evoke a sense of nostalgia and romanticism, and they are often used to describe a time when things were simpler and quieter. Whether you are writing a historical novel or reminiscing about the past, these synonyms for days of yore will surely add color and depth to your writing.