Dave O'Leary holds the record for the most appearances by any player for Arsenal.
He made his debut in 1975, and when he left 18 years later he had taken his place in the history of Arsenal.
He wasn't a tough-tackling central defender, but he depended more on his excellent positional sense and his ability on the ball.
He was never seen as a hard man, which was in contrast to most of the other Arsenal defenders throughout his career, and he rarely found himself in trouble with referees.
If O'Leary got involved with another player on the pitch it was for a very good reason, as he was always seen as a gentleman when he played.
All but one of these 10 players were voted into the top 50 Arsenal players of all time by Arsenal fans. The only exception is Sol Campbell, and that's probably because he once captained their local rivals Spurs, which just cannot be forgiven by some fans.
As well as that, seven of those 10 players are included in the list of the 20 players with the most appearances ever for Arsenal. Sol Campbell, Steve Bould and Kenny Sansom didn't make the list, but four of the defenders I've profiled were in the top five.
At the moment, the Arsenal defence is struggling more than I can ever remember seeing it struggle, and a few players to those listed would be a welcome bonus at the club.
That's it for today.
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