[IdomeoreTew]

The main reasons why Madhabs are preserved are writing writing writing...

If it's not written it shall be lost sooner or later.

Here are some of the Madhabs I came across while reading related articles:

1- Madhab 'Abdullah Ibn Mas'oud d.32
2- Madhab Umm al-Mumineen 'Aisha d.57
3- Madhab 'Abdullah Ibn 'Umar ibn al-Khattab d.73
4- Madhab 'Umar bin 'Abdul-'Aziz bin Marwan bin al-Hakam d.101
5- Madhab Ibn Jabr Mujahid died after the 100th year after hijra
6- Madhab 'Amir al-Sha'abi died after the 100th year after hijra
7- Madhab Ibn abi Rabah 'Ataa d.114
8- Madhab Suleiman ibn Mahran al-A'amash died between 147 and 148 hijri
9- Madhab al-Nu'uman ibn Thabit Abu Hanifa d.150
10- Madhab 'Abdul-Rahman ibn 'Amro al-Ouza'ee d.157
11- Madhab Suffiyan al-Thawri d.161
12- Madhab al-Layth ibn Sa'ad d.175
13- Madhab Malik ibn Anas d.179
14- Madhab Suffiyan ibn 'Uyaynah d.198
15- Madhab Muhammad ibn Idris al-Shafi'i d.204
16- Madhab Ishaq ibn Ibrahim ibn Rahaweih d.238
17- Madhab Ahmad ibn Hanbal d.241
18- Madhab Dawoud ibn 'Ali al-Dhahiri d.270
19- Madhab Muhammad ibn Jarir al-Tabari d.310