Was in the time and place when Jesus preached, common for someone to do so in the manner Jesus did it?
(Of course, Jesus was unique, even from the point of view of someone who completely disbelieves everything about the religious views about being the Messiah. He played a very important role in defining our culture, society and value systems. This question tries to limit itself only to the aspects of the local culture and customs of that era from a secular point of view)
So, let's reconstruct the image of a man, not too old (so not conforming to the "wise old mentor" archetype), who moves from town to town, has a very small group of loyal disciples always traveling with him, who holds religious sermons but is not part of (and does not respond to) the priestly hierarchy, but still seen by most people as having a vast and correct knowledge of the religious law. He gathers hundreds, and sometimes thousands of listeners while holding speeches. They do not gather any worldly possessions (land, buildings, infrastructure) besides what is strictly needed for day-to-day survival. He spends a lot of time helping the poor or at least comforting them. Many people start viewing him as a prophet, or even as the fulfiller of an old prophecy.
The above is just a small summary, take further descriptions about Jesus and the disciples strictly as presented in the canonical Gospels. Having done that, let's look at the non-biblical sources and what we know about the customs and culture of that time and place. Was it common or very uncommon for such preachers to be active there? Do we have sources about other people living like that and preaching like that, besides Jesus and maybe John the Baptist?
What I would like to take a look at, is that from the perspective of a man who lived in that place and time, listened to one or a few public speeches of Jesus (but was not a disciple or a closer associate), and later, after Pentecost, might have joined this new movement which later developed into Christianity, how would this person have viewed what he saw and heard? Was it likely that he listened to many similar preachers before, who were leading a similar lifestyle, preaching, traveling etc. by similar means and it was just Jesus whom he had seen as much more convincing than the other ones, or was it very likely for Jesus to be the first such person in his life?
Please note, again, that this question is not about whether it is true or not what specific religions teach. It's solely about whether we have any sources about other contemporary people having similar lifestyles and activities as Jesus is described to have had.