The first known attempt to climb the face of the cliff was made in 1968 during the wet season.

Atenism was the first known attempt at monotheism in the world.

The operation was the first known attempt to separate adult twins joined at the head.

There is no known attempt by anyone to claim or enforce a copyright on the lyrics.

So far, Toad has made no known attempts to rejoin him.

So there's two known attempts from the last ten years alone, and there are possibly others that have gone below the radar.

The only known attempts to mate the two have produced stillborns.

Similar rules applied through the period and there was no known attempt to standardise bat or ball size until much later.

This is the first known attempt at computerized arbitrage trading.

None of these was ever successful, and after his last known attempt in the later 1930s he disappeared, apparently to avoid securities fraud charges.