@Duckweed
Oh, I don't mind long turnsets... it's just that it takes 3 seconds for the screen to refresh the image whenever I move around

Not very accustomed to slow civing.
Re war plan
It will be important for Bugg to note how many and what units are in which city. Either screenshot or just a marker over the city. Please
also take note of roaming Galleys. We don't want to risk our Galleys against his and will want to send the Trireme near his galleys.
The most important is to capture Aksum right away. Depending on how many troops are sighted there by the Trireme, then we count 2 Maces for each Longbow and 1:1 for other troops. 6 Maces is likely to be enough after a suicide catapult -> 6 Maces, 1 catapult, 1 WIII warrior. Since we're selling ZY some gold and we've given him Aesthetics, there's a good chance he's stupidly building S.Paya in Aksum so there won't be that many units there.
4 Galleys for Aksum
We will need 6 Accuracy bombards to get Gondar's defenses down which does not give us sufficient time to bring in reinforcement, unless we have some unharmed Maces after the attack on Aksum. Either 3 turns with 2 catapults or 2 turns with 3 catapults. The problem becomes that 3 Maces isn't enough to capture it though. We can otherwise have 4 maces 2 catapults:
1st turn bombard, 2nd turn 1 bombards the other suicides then cleanup with 4 maces should be doable.
For Lalibela, I think we might have to wait an extra turn as its borders are likely to expand in the next 10 turns and we won't have spare galleys to move troops, so 2 turns of marching inside his culture will be required. It likely won't have walls by the time we declare war but he can always put some up. 3 catapults and 5~7 maces will be more than enough though. 1 non-Accuracy catapult to suicide on second turn of Bombardment.
Upon Aksum's capture, all Galleys will merge there and get ready to ship to Corboda. From dingding's screenshot,
we can see what was there on t156 : 1 sword and 1 Archer.
Troops should be sent there ASAP. I expect it will still only have 20% culture defense so that only 2 Catapults are necessary. 4 Maces should be sufficient as well.
Once Zara's remaining 2 cities are captured, everything converges to Aksum, heals and then ships to Madrid. Hopefully Izzy will have built a shrine by then!
If she is willing to capitulate then, we should consider it to gain time. However Seville or Barcelona are both good prizes, one featuring Dyes and the other having 2 good food resources.
Seville is the better city but Barcelona gives us Dyes which in turn means we'd only require to trade for Silk (no biggie really).
Anyway, we should really capitulate Izzy so if she's not willing to capitulate by that point we may need to raze a city of hers.
To re-capitulate
Troops: [safe side]
Aksum: 4 spies in place [they need to gain some discount for the revolt to work], 4 galleys (WIII warrior, 1 suicide catapult, 6 Maces)
Gondar: 3 galleys (2 Accuracy catapults, 4 Maces)
Lalibela: Rest of troops will walk there. Should have 3+ Catapults and maybe 6 maces
Total: 4 spies, 7 galleys, 6 catapults, 16 maces
Plan of war
T0 DoW, land troops next to Aksum&Gondar - walk troops towards Lalibela
T1 Revolt Aksum, suicide catapult, capture Aksum, Move Galleys to Aksum - Bombard Gondar - walk troops next to Lalibela
T2 Bombard Gondar, suicide 1 catapult, capture Gondar - Bombard Lalibela, suicide 1 catapult, capture Lalibela
T3-T5 heal in Aksum (WIII warrior) - accept capitulation - move troops to capture Corboday as available (2 Accuracy catapults, 4 Maces, 1 of the catapult may be used to suicide on Longbows)
At that point I will probably stop as it will have taken me 2 hours to play the 5 turns
We will need to keep a supply of units, some catapults mainly and maces depending on our losses.