The summoners and guardians who died on Gagazet trying to obtain the final summon?

Master of history- The final summoning in itself is historical, summoners have journeyed to obtain it for a very long time, dating back to Yunalesca

Lord of naught- They never did obtain the summoning as they died on Gagazet

Nigh fell in the great deed- They were extremely close to Zanarkand, but ultimately could not make it

Lost, not alone- Yuna and party encountered several graves marking the deaths of several summoner/guardian parties, so they are not alone

That's all I could think of