Future Earth-62015

Future Earth-62015 is an altered timeline where Trunks comes from.

The Death of Son Goku
Following the failed assault by Frieza and his father, King Cold, Son Goku died of a heart disease that wasn't curable at the time.

Reign of the Androids
Not long after, two androids called 17 and 18 were released to kill Goku and his allies. After they succeeded, they went on a carefree rampage of the world, leaving only pockets of civilization left to be defended by Son Gohan (Goku's son) and Trunks Brief. Following the death of Gohan, Trunks travelled back in time to become strong enough to destroy the Androids, and after they were, he destroyed Cell and Babidi.

Goku Black and Zamasu
With the appearance of Goku Black, a being that resembled Goku but was not in any way the same, came the mass extinction of nearly all life in the universe. Trunks once again travelled back in time, and this time brought the Goku of that time alongside his allies to fight Black and his ally, Zamasu. Black reveals that he's Zamasu from another timeline who used the Super Dragon Ball and Reality Stone to swap bodies with Goku. During the final battle, Black and Zamasu fuse together, becoming an even more powerful being. When Trunks destroyed the fused Zamasu, his spirit remained and began to consume the entire universe and other timelines, but Goku was able to call on the aid of the king of the Multiverse, Zen-Oh, and the entire reality was destroyed, with Zamasu the only casualty since Zamasu already killed all life.

Rebirth
To allow Trunks and his last living ally, Mai, to return to their time, the God of Destructions attendant, Whis, travelled through time to before Black's creation and had the Beerus of that time destroy Zamasu, thus allowing this timeline to be restored (With doppelgängers of Trunks and Mai), while the reality where Zamasu was destroyed now a void of nothingness.