We know from some of the chronicles that the old 2nd empire jovians settled in Anoikis however one of the last 3rd empire jove,Veniel gives us a wealth of information altho incomplete as it may be.
Anoikis was created by the Talocan an ancient race whose achievements dwarf anything the jovians accomplished as a race.The Talocan had presence within Anoikis before the jovians who we call Sleepers arrived but we don’t know if the 2 groups coexisted for some time or at the arrival of the Sleepers the Talocan had already moved on.
My supposition is that the Talocan departed Anoikis before the Sleepers arrived.
Acording to Veniel during the jovians expeditions within Anoikis it was discovered alot of Sleeper pods were missing.
It’s quite likely the jovians within Anoikis started feeling the effects of the jovian disease and internal strife may have started to form.
We can bet they were examining both old Talocan outposts left behind and ships.
What if the disease caused a rupture in the Sleepers unity some deciding to avoid the disease by going into cryogenic sleep and leave behind advanced drones to guard them in Anoikis while others went on a path following the Talocan trail which led them to what we call as abyssal deadspace.
The old Talocan instalations and ships in Anoikis have sockets which could house engines very similar to the ones used by triglavian ships.
It’s likely upon arriving in abyssal deadspace the splinter Sleepers adopted the technology and made it their own.
We know now thanks to some intrepid capsuleer analysis that abyssal space has enough individual systems to house a civilisation,these too could possibly have been modified by the Talocan to suit their needs similar to wormhole effects in Anoikis.
We could also safely deduce the Talocan departed abyssal space or simply died out as given their technological advancement if triglavians were true Talocan we’d be no match for them.
Now for the ‘could we capsuleers fight jovians’ debacle.
The only large scale jovian battle was at Vak’Atioth despite the impression it made on the other 4 empires we can make a clear assessment against capsuleer capabilities.
The amarr fleet during that fight was a sorry excuse for a combat force lacking clear communication and coordination while the jovians had both.Furthermore their ships efficiency was affected by the lack of capsule technology. Despite their antiquated ships and lack of communication coordination and capsule tech by the end of the battle the amarr had destroyed one third of the jovian ships.Now if we are to introduce a similar battle against capsuleers it’s likely the jovians could lose quite badly given modern capsuleer combat prowess and coordination.So yes we could fight jovians quite fine it would be hard but not impossible.