The Themes Included with RISC OS Pi

Playing around with my new install, loving it so far but a silly thing has been bothering me: I notice the themes all seem to be very similar, apart from the RBP one. Obviously these are probably made to look like historical versions of RISC OS but which is which? Aside from Morris 4 = RISC OS 4 I can’t figure out what each theme is supposed to be. Be gentle if it’s glaringly obvious I’m brand new to this system!

EDIT: Would help to show what I’m talking about

Ursula is the code name of the OS for Phoebe, the MkII RiscPC that never quite was. Sovereign pertains to RPCEmu and the RiscPC softload. The modern themes are similar but the ‘task manager’ sprite varies.

Sovereign pertains to RPCEmu and the RiscPC softload.

And Beagleboard/Pandaboard. It’s basically the same as the Iyonix theme but with the ROOL cog instead of the Iyonix jellybean.