Memories of Celceta, the most recent one on Vita. It had two/three other versions prior, none of which were from Falcom directly. All versions take place between 2 and 3 with the same setting and a select bunch of characters and plot elements.
One was by some dev called Tonkin House for Super Famicom called Mask of the Sun, which later got a budget remake by Taito for PS2. Despite mediocrity, it was considered the canonical version up till Falcom's own title.
The other entry was The Dawn of Ys by Hudson Soft for the Turbografx-CD which, crucial plothole aside, overall had a pretty charming story with solid gameplay and my favourite soundtrack in the series. I still hold it in some regard above Memories of Celceta and a lot of other entries in the series, even with its use of the old bump combat. There exists an English text hack thankfully. It even got a full fandub for the several voiced segments. Its quality is about on par with 90's dubbing, sans horrible audio clipping on a few characters.