Long ago is a phrase used to indicate a period of time that happened far in the past. However, there are many synonyms and phrases that can be used to indicate the same. Some examples include "in days of yore," "ages ago," "once upon a time," "a long time back," "back in the day," "many moons ago," "in a bygone era," "in ancient times," and "in the distant past." Each of these phrases can evoke a different feeling or mood, and can be used in various contexts to add a sense of nostalgia or to convey the sense of how far removed the past is from the present.