990 A.D.

Lavos Timeline

-On June 24th, Taban blows off a hike with Lucca, and her mother has an 
accident which costs her use of her legs.

Keystone T-1

-On June 24th, Taban blows off a hike with Lucca, and her mother loses the use 
of her legs. 
-Lucca enters June 24th through a strange gate, probably granted by the Entity
or made herself.
-Lucca saves her mother. 
-Lucca blanks out until July 2, upon which she returns to 1000 A.D.

Keystone T-2

-On June 24th, Taban blows off a hike with Lucca, and her mother loses the use 
of her legs. 
-Lucca enters June 24th through a strange gate, probably granted by the Entity
or made herself.
-Lucca saves her mother. 
-Lucca blanks out until July 2, upon which she returns to 1000 A.D.

From: Chronology