What was the name of Robert Plant's band before he was in Led Zeppelin?

Crawling King Snakes

He has fronted the Crawling King Snakes, Band Of Joy, the Honeydrippers, and Priory of Brion, but Robert Plant will forever be known as the voice of Led Zeppelin, one of the greatest and most influential voices in rock music history.
http://www.bbc.co.uk/herefordandworcester/musicmap/artists/robert_plant_kidderminster/your_stories/robert_plant_coombe.html

have to agree with Gary

He played with various groups in the 1960s such as The Crawling King Snakes, Listen, Hobbstweedle, The Band of Joy (with John Bonham), which concentrated mainly on the blues. In 1967, he released several solo singles on CBS, but it was a far cry from his true capabilities.

https://en.wikipedia.org/wiki/Robert_Plant#Early_life_and_musical_beginnings

I think you might find the band was called Hobbstweedle. Plant was recommended by Terry Reid of Procol Harum who turned down the chance to join.

In the summer of 1968, the Yardbirds' Keith Relf and James McCarty left the band, leaving Page and bassist Chris Dreja with the rights to the name, as well as the obligation of fulfilling an upcoming fall tour. Page set out to find a replacement vocalist and drummer. Initially, he wanted to enlist singer Terry Reid and Procol Harum's drummer B.J. Wilson, but neither musician was able to join the group. Reid suggested that Page contact Robert Plant, who was singing with a band called Hobbstweedle.

After hearing him sing, Page asked Plant to join the band in August of 1968, the same month Chris Dreja dropped out of the new project. Following Dreja's departure, John Paul Jones joined the group as its bassist. Plant recommended that Page hire John Bonham, the drummer for Plant's old band, the Band of Joy.

http://en.citizendium.org/wiki/Obs-Tweedle

Band of Joy

Mini biography: Prior to Hobbstweedle (a pickup blues band formed to honour a gig at West Midlands College Of Education) Robert was the frontman for The Band of Joy - featuring Percy, John Bonham, Paul Lockey (bass), Chris Brown (keyboards) and Kevyn Gammond (guitar). The BOJ were on verge of making a record deal when they split a little acrinmoniously. This led to Rob eventually joining Led Zeppelin after a few blind alleys. The rest is history.

http://www.imdb.com/name/nm0686619/bio