Board Thread:Questions and Answers/@comment-11927664-20130722233815/@comment-893506-20130722234558

There were 12 captains.

1: Genryūsai Shigekuni Yamamoto 2: Yoruichi Shihōin 3: Rōjūrō Ōtoribashi 4: Retsu Unohana 5: Shinji Hirako 6: Ginrei Kuchiki 7: Love Aikawa 8: Shunsui Kyōraku 9: Kensei Muguruma 10: Unknown (said to have been killed in action) 11: Kenpachi Kiganjō 12: Kisuke Urahara 13: Jūshirō Ukitake

So, as you can see, there were only 12 captains back during the TBtP story. The 10th Division captain was killed in action sometime before Urahara took over the 12th Division's captain position, and Kiganjō never showed up during captain's meetings, which is why we never got to see him during that time.

Kiganjō was also Kenpachi Zaraki's predecessor, and Zaraki would kill him sometime after the TBtP arc, but before the main story.