Them Line Up : Van Morrison [Vocals & Harmonica], Eric Wrixon [Piano & Keyboards], Billy Harrison [Guitar], Alex Henderson [Bass Guitar], Ronnie Millings [Drums]

Them are probably best known for featuring the talents of a young Van Morrison, however, the band also featured Eric Wrixon on Keys who would end up being part of the origianl line up of Thin Lizzy.
The Black Eagles Line Up : Phil Lynott [Vocals & Bass Guitar]; Brian Downey [Drums]

In 1965, Phil Lynott and Brian Downey palyed together in a band called The Black Eagles.
Skid Row Line Up : Phil Lynott []; Brendan 'Brush' Shields [Guitar]; Gary Moore [Guitar]; Robbie Brennan []
Sugar Shack Line Up : Brian Downey [Drums]

Recorded a single called 'Morning Dew'
Orphanage Line Up : Phil Lynott [Vocals]; Brian Downey [Drums]; Joe Staunton [Guitar]; Pat Quigley [Bass Guitar]; Terry Woods []

Thin Lizzy [Mark 1] Line Up : Phil Lynott [Vocals & Bass Guitar]; Brian Downey [Drums]; Eric Bell [Guitar]; Eric Wrixon [Keyboards]

Formed in 1969
Fastbuck Line Up : Scott Gorham [Guitar]

Scott Gorham played with a band called Fastbuck prior to joining Thin Lizzy
Thin Lizzy [Mark 2] Line Up : Phil Lynott [Vocals & Bass Guitar]; Brian Downey [Drums]; Scott Gorham [Guitar], Brian Robertson [Guitar]

Eric Bell left the band and was soon replaced by Scott Gorham and Brian Robertson giving Lizzy their trademark twin lead guitarists.
Wild Horses Line Up : Brian Robertson [Guitar], Jimmy Bain [Bass Guitar]

Brian Robertson left Thin Lizzy in 1978 and went on to join Wild Horses
Colleseum II Line Up : Gary Moore [Guitar]

Gary Moore had been playing with a band called Colleseum II prior to joining Thin Lizzy. Gary Moore had previously performed with Lynott as part of Skid Row.
Thin Lizzy [Mark 3] Line Up : Phil Lynott [Vocals & Bass Guitar]; Brian Downey [Drums]; Scott Gorham [Guitar], Gary Moore [Guitar]

With the departure of Robertson, Gary Moore was recruited on guitar. As well as playing with Phil Lynott during his Skid Row days, Moore had already performed with Lizzy as a temporary replacement for the injured Robertson. However, Moore's time with the band was to be relatively short.
The Rich Kids Line Up : Midge Ure [Vocals & Guitar], Glen Matlock [Bass Guitar], Rusty Egan [Drums], Steve New [Rhythm Guitar]
Thin Lizzy [Mark 4] Line Up : Phil Lynott [Vocals & Bass Guitar]; Brian Downey [Drums]; Scott Gorham [Guitar], Midge Ure [Guitar]
Ultravox Line Up : Midge Ure [Vocals], Chris Cross [Bass Guitar], Billy Currie [Keyboards & Violin], Steve Shears [Guitar], Warren Cann [Percussion], John Foxx [Vocals], Robin Simon [Guitar]

By 1980, Midge Ure had left Thin Lizzy and joined Ultravox
Thin Lizzy [Mark 5] Line Up : Phil Lynott [Vocals & Bass Guitar]; Brian Downey [Drums]; Scott Gorham [Guitar], Snowy White [Guitar] Darren Wharton [Keyboards]

With Midge Ure's departure, the second guitar slot was taken by Snowy White. Around this time, Darren Wharton also joined the group on Keyboards.
Tygers Of Pan Tang Line Up : John Sykes [Guitar]
Thin Lizzy [Mark 6] Line Up : Phil Lynott [Vocals & Bass Guitar]; Brian Downey [Drums]; Scott Gorham [Guitar], Darren Wharton [Keyboards], John Sykes [Guitar]

Snowy white only stayed with the band for a short period and was replaced by John Sykes. Sykes had previously played with the Tygers of Pan Tang.
Dare Line Up : Darren Wharton [n/a]
Blues Up Front Line Up : Brian Downey [Drums]
Grand Slam Line Up : Phil Lynott [Vocals & Bass Guitar]; Robbie Brennan []
Phil Lynott Line Up : Phil Lynott [Vocals & Bass Guitar]
Whitesnake Line Up : John Sykes [Guitar]
Blue Murder Line Up : John Sykes [Guitar]
John Sykes Line Up : John Sykes [Guitar]
21 Guns Line Up : Scott Gorham[Guitar]