"Commodius vicus" refers to Giambattista Vico (1668–1744), who proposed a theory of cyclical history in his work "La Scienza Nuova" ("The New Science"). Vico argued that the world was coming to the end of the last of three ages, these being the age of gods, the age of heroes, and the age of humans. These ideas recur throughout "Finnegans Wake", informing the book's four-part structure. Vico's name appears a number of times throughout the "Wake", indicating the work's debt to his theories, such as "The Vico road goes round and round to meet where terms begin". That a reference to Vico's cyclical theory of history is to be found in the opening sentence which is a continuation of the book's closing sentence – thus making the work cyclical in itself – creates the relevance of such an allusion.