1. Historical notes :
The territory of Rumbek Diocese reserved, under the colonial rule of zones of religious influence, to the Episcopalian Church; Catholic expatriate missionaries were not allowed in.
In 1995 a new Ap. Vicariate was created assigned to local clergy who were free to settle and operate freely. The first Sudanese Bishop, H.L. Ireneo Wien Dud, was at the head of the Vicariate.

03.07.1955 Apostolic Vicariate of Rumbek
12.12.1974 Diocese of Rumbeck, suffragan of Juba.

2. Extent :  The diocese comprises the three provinces (Rumbek, Yirol, Chuoibet) of the Buhairat State, the two provinces (Warap, Tonj) of the Warap State.

- Pastoral situation : By a written understanding with Bishop of Wau, the communities of Wau Diocese beyond their reach are entrusted temporarily to the Ordinary of Rumbek ; Wau diocese supports with personnel and other resources according to availability. Practically the following areas are under the care of Rumbek Ordinary : North Bahr el Ghazal State (except for Aweil Town and along the railway) ; the provinces of Gogrial, Turalei and Apuk of Warap State ; all communities living 15-20 miles from Wau.

- Area : 56.318 sq. km. - Population : 1. 500.000 - Catholics : 125.000

3. Ordinary :  H.E. Bishop Caesar Mazzolari, MCCJ, born at Brescia (Italy) 9.7.1937 ; ordained Priest 17.3.1962 ; appointed Apostolic Administrator of Rumbek in 1990, appointed Bishop on 21.11.1998, consecrated on 6.1.1999.

Address : P.O.B. 21102 Nairobi (Kenya) - Tél :  254/2/562247, 569130. fax  + 254/2/566668 e-mail scio@maf.org

- Predecessors :
1955 -  1960  Bishop Ireneo Wien Dud, Apostolic Vicar
1960 - 1972   Msgr. Lino Tiboi. Aposotolic Administrator
1972 - 1975   Bishop Ireneo Wien Dud, Ap. Vicar of Wau, Apostolic Administrator
1975 - 1976   Bishop Gabriel Zubeir Wako
1976 - 1982   Bishop Gabriel Dwatuka
1982 - 1983  Archbishop Agostino Baroni, MCCJ, Ap. Administrator
1983 - 1990  V.Rev. Fr. Giuseppe Pellerino, MCCJ, Ap. Administrator
1990              Bishop Caesar Mazzolari, MCCJ, Ap. Administrator up to 1999, then Bishop.

4. Diocesan Offices :
Vicar General : Fr. Raphael Riel
Rector Minor Seminary Kitale 
Information Office "SCIO" 

6. Parishes :
6.1. - Rumbek Town - Founded in 1952
- 12 prayer centres, - main centre is Wulu
- Schools in Rumbek and Wulu
- Health Centre

6.2. - Mapuordit  - Founded in 1993
- Primary-school, Secondary school
- Health Centre

6.3 - Maria-Lou - founded in 1994
- Girls hostel for students
- Comboni primary school
- Texbooks and aids to 67 schools in the area of Tonj
- Health centre

6.4. - Agang - Rial - Founded in 1995
- 22 prayers centres
- Youth association
- Comboni School
- Health centre

6.5 - "Pastoral safari team" in the Diocese of Wau
The centres of the Diocese of Wau are regularly visited : Lounaker, Madhol, Malwalon, Mayen, Abun, Nyamlell, Gogrial, Marial Bai, Aweil East and West.

6.6 - Kakuma -  Refugees’ camp - Founded 1992
- 7 Prayer centres, 37 catechists
- 102 Small Christian Communities
- Multipurpose Centre for Youth and Women Assoc.
- Sunday School

6.7 - Kitale (Kenya) - Opened in 1997

It is a formation institute for seminarians, catechists, teachers of Christian religion in schools from Southern 
- In Jan 1999, 80 Minor Seminarians, 23 Catechists, 47 Teachers are enrolled

6.8 -  Bethany House  (Nairobi) - opened in1994

Address : P.O.B. 21102 - Nairobi (Kenya)

We give the list of the old parishes ; they are the good « roots » ; they are « at rest » under the cross, waiting for their resurrection.

6.9 - Choibert  - Founded in 1976

6.10  Thiet -  50 km N - Founded 1949

6.11 - Tonj - 100 km W - Founded 1953. Headquarter of the same province of the Warap State.

6.12 - Yirol - 100 km NE - Founded in 1959 - Headquarter of the same province of the Buhairat State

6.13  - Warap - 150 km NW - Founded in 1952. Capital of Warap State