We have everything from the naming of a river to a pioneering jockey as our Toby Gibbs look back at this week and Kentucky history.

Dr. Thomas Walker named the Cumberland River on April 17th, 1750.

It's believed he named it after William Augustus, the Duke of Cumberland, the youngest son of King George, the second.

The river begins in Harlan County, flows into Tennessee, then flows back into Kentucky and empties into the Ohio River in Livingston County.

Kentucky adopted its constitution on April 19th, 1792, about six weeks before joining the union.

On June 1st.

On April 15th, 1861, America's only Kentucky born President Abraham Lincoln called for 75,000 troops to put down the rebellion in the South.

Kentucky's governor, Mariah Magoffin, refused to provide any Kentucky troops as he declared Kentucky a neutra Four years later, on April 15th, 1865, President Lincoln died just hours after being shot at Ford's Theater by John Wilkes Booth.

Isaac Burns was born April 16th, 1861, somewhere in central Kentucky.

The exact location is unknown.

Known later as Isaac Murphy, he became the highest paid jockey of his era.

He won three Kentucky Derbies in 1884, 1890 and 1891.

Workers like the last rail line on a short line railroad from Louisville to Covington.

On April 18th, 1869.

The 106 mile railroad cost almost $4 million to build.

And that's a look back at this week in Kentucky history.

I'm Toby Gibbs.