What are the earliest witnesses for the Christian cross with the different shapes?

1. [Anastasis • Resurrection](https://dzen.ru/a/ZXNFALUrMW9CfeYc) https://www.pravenc.ru/text/2459015.html 2. I am not really sure if this is Christian. Some say it is. https://herculaneum.uk/Ins%205/Herculaneum%205%2015%20p4.htm 3. https://www.livescience.com/42761-ancient-church-mosaics-uncovered-israel.html 3. https://fr.wikipedia.org/wiki/Croix_(christianisme) 4. https://www.pravenc.ru/text/2459015.html 5. [Mosaics of the Basilica, mid-6th century CE, inside the Memorial Church of Moses, Mount Nebo, Jordan](https://commons.m.wikimedia.org/wiki/File:Mosaics_of_the_Basilica,_mid-6th_century_CE,_inside_the_Memorial_Church_of_Moses,_Mount_Nebo,_Jordan.jpg) Why are there so many cross variants, and are there ancient writers that describes them? Why do we see so rare in the early time the standard latin cross without enlarged ends? But instead we see with enlarged ends. Thanks in advance.