I think such parts of the story of Jesus that could have had some grain of truth in some actual person were probably not all based on the same person. Some of these persons could have lived within a century of 1CE, or AD if you prefer. But some parts possible were borrowed tales about people who actually live hundreds or even thousands of years before 1CE, and whose already mythified tale passed into the ears of those transmitting christain oral tradition during 1st or 2nd century CE, and were accreted onto corpus of tales about their idol by these oral story tellers to embellish the foundation myths of their cult.
But it is possible, I think it likely, that largest fraction of such parts of Jesus story that had grains of truth in lives of real person had their grain of truth in the same person, and we might as well call that person the historic jesus.
But it is possible, I think it likely, that largest fraction of such parts of Jesus story that had grains of truth in lives of real person had their grain of truth in the same person, and we might as well call that person the historic jesus.