1) The Ketchawa Mosque was originally built in 1612-1613 during Ottoman rule in Algeria and was enlarged in 1794. 2) In 1932 during French colonial rule, parts of the mosque were demolished and it was converted into the Cathedral of Saint Philippe. 3) After independence in 1962, the building was reconverted into a mosque again and has undergone several restorations.

1. Ketchawa
Mosque
Réalisé par :
PhD Bouteldja Abdelbasset
Supervised by Prepared by
Mme Adjali Mr.Bouteldja abdelbasset
People's Democratic Republic of Algeria
Saad Dahleb university
Institute of architecture

2. Workplan

4. History of Ketchawa
Plan and section of the mosque before 1932 Plan and section of the mosque after 1932

5. A- Ottomane period :
The Cathedral at its base was a mosque which was called Ketchawa
was build in 1612/1613 under the government of the Ottoman
regency in Algeria, Establish the existence of the district of a
Ketchawa mosque (the name is of Turkish origin Ket = Plateau,
Chawa = goat) where does the name come from of the mosque.
-Hassan Pasha enlarged the mosque considerably in 1794 the
ESSAIDA mosque was modeled for this construction.
MARÇAIS Georges, Manuel d'art musulman : L'Architecture
(Tunisie, Algérie, Maroc, Espagne, Sicile
Ketchawa mosque during the ottoman gouvernance
Essaida mosque during demolition, which was the architype of the
new ketchawa mosque in 1794, sourse :Albert Devoulx , El-Djazair ,
Histoire d’une cité d’icosium a Alger

6. Plan of the mosque during the Ottoman periode
Plan of the mosque durin the ottoman rule
Source: Ahmed Kamas, Chehrazed Nafa , L’Algérie et son patrimoine
The mosque was a masonry
structure with a rectangular form
The prayer hall was organized
around a large cupola dominating
the space and composed of
three horizontal crossing and two
vertical crossing
The mosque had one square
based minaret in the west side.

7. B- French colonial period:
In 1932 during the French rule the mosque was partly demolished and reconverted into the
Cathedral Saint Phillippe, and became the first cathedral of Algeria which remain until 1962.
Cathédrale Saint-Philippe, Alger
Source: Library of Congress Prints and Photographs
Division Washington, D.C. 20540 USA, circa 1860-1920.

8. - Plan of the cathedral saint Philipe , propsed by Amable
ravoisié , L’exploration scientifique de l’Algérie
proposé par Amable Ravoisié sous le cadre
de l’exploration scientifique de l’Algérie
The Cathedral of saint Phillippe is a
masonry structure with a rectangular
plan. Resembling to a classical cross
shaped cathedral in plan, various sizes
of domes complement the shape to a
rectangle, Having an approximately 57
meters length and 21 meters width,
The cathedral is a massive historical
structure with two minarets in the main
façade soaring up to 32 meters high
and a Bell tower of 34 m of high .
The interior is organized by a main nave
that covered with a barrel vault carrying
by a series of arches, and supported by
marble circle base pillars
Description of the cathedral:

9. Figure 3. Cross-section of the cathedrsl in the longitudinal direction.
Source: Amable Ravoisié , l’exploration scientifique de l’Algérie

10. • C- Post- colonial periode
Photo of the mosque after the independence
Source: KOUMAS Ahmed, NAFAA Chéhrazade
« L'Algérie et son patrimoine
Memorial panel showing the date of the 1st Friday
prayer after independence
After the independence in 1962, The cathedral was reconverted into a mosque again, from where it has
several restoration operations, mainly due to the instability of the ground and because of an
emerging damage on minarets and some part of vaults due to some important seismic events at the last
decade., the last operation began in 2008 and achieved in 2018
A wall of qibla in the north-south direction was added on the east of the structure,

11. Architectural style :
The mosque style is actually the
cathedral, represent e mixture of
two styles which the first is the
Romano-Byzantine materialized by
the rectangular plan, the use of a
big dome, the decoration with
mosaics inside the building.
-the second style is The Turkish-
Arabic style is also represented by
the use of (arches, massive carved
doors, the use of earthenware)
3D model of Ketchawa mosque
Source : Gulseren Erol, Korkut Kaynardağ, Semih Gonen, Haluk Sesigur
Repair and retrofit of Ketchaoua Mosque in Algeria, Conference Paper ·
January 2016.

12. Space organisation:
Process by a monumental staircase
of 2 flights of 20m in width
The threshold of the entrance is
rectangular composed of
3 spans supported by marble
columns, and supporting a broken
arch
The entrance hall :
Entrance hall of the mosque , source :
personal picture

13. Secondary entrance (west)
It opens onto the side nave on the
arm of the transept by 2 doors
separated by a light wooden
partition
Secondary entrance, source personal picture

14. - Secondary entrance:
It opens onto the right side nave
which leads directly to the
central nave by an arch.
Composed of a 1.4 m door
Secondary entrance, source personal picture

15. It is the largest space in the building,
it is a rectangular space of 21 *
11.35 m divided into 6 spans, the
first of which has been converted
into a mihrab wall.
The main nave

16. Crypts
Crypts inside the prayer hall, source:
personal picture

17. Le mur de Qibla , le Mihrab et le Minbar
The wall of Qibla is 4.3m high
which separates the central nave
and the main entrance, the base
of which is tiled At the axis of this
space is the Mihrab, covered by a
half dome and surmounted by a
broken arch, on the right side of
this partition is grafted a marble
Minbar of rectangular shapeQibla wall, source personal picture

18. The Lateral naves: right and left
It is a rectangular space of 21 * 3.6m which
opens directly on the Nave by 5 broken arches
thus divides this space into 6 identical span of
square shape 3.6 * 3.6 m, each span of which is
covered by a dome of hexagonal base
Lateral nave, source: personal picture Mini dome , source: personal picture

19. The transept and the cross of the transept:
The transept is a space with a square base of
11.25 m, it constitutes the articulation of the building
There are two arms of the transept Right
and left It’s a rectangular
space of 11.25 * 3.2 m Each of these
two spaces is covered by a barrel
vault 15.25m high and 4.7m in radius

20. The Choir:
It is a space composed of two spans,
each bay has three identical spaces
separated by a peristyle, each space
has a rectangular shape of
-In each span there are 3 spaces of
square shape, and each space is
covered by a hemispherical dome of
1.6m radius

21. Exterior Description
The Cupola
the mosque is covered by a hemispherical
dome with a radius of 4.7 m, the outer
envelope of which is 28 m high

22. Bell tower :
the former bell tower is located which
is constituting the highest part of the
whole structure with 34 meters.

23. The cover of the central vessel of
the nave
It is a barrel vault with a height of 14.85
m resting on identical
marble columns with a radius of 0.53 m

24. The Minarets
There are two identical minarets on the main facade
Each minaret is composed of two parts, the first of
which is square in base and has 2 openings, one to the
north and the other to the east
The second part has an octagonal shape, the latter is
divided into 2 superimposed elements, separated by a
balcony
At the upper part of the tower we find the
lantern which is circular in base

25. 1- Stone:
creamy yellow in color, the main material used for the construction of the monument
Stone wall in the mosque
Construction materials

26. 2-Brick:
used in the construction of cupolas and vault
The vault from the inside of the building

27. Columns of the entrance hall
3-Marble:
white marble is the most answered in the building we find it in the columns, wall plaques in the
basement

28. 4-Wood:
Main entrance doorSecondary entrance door
Used for stairways of towers and door and window joinery

29. 5-Plaster:
A pillar decorated with plaster
Used for floral theme decorations inside the building

30. 6-Ceramics:
Ceramic tiles on the lantern
it is presented in the form of tiles, used different part of the building
Ceramic tile on the base of the domeCeramic tile on the base of the dome
Ceramic tiles on the qibla wall

31. 7-Mosaic:
used as decoration on the facade of the main entrance and inside the mosque
Mosaic on the wall and cupola

32. Bibliography :
• Ahmed khamas et Chehrazed nafa , l’Algérie et son patrimoine
• Albert Devoulx, Revue africaine volume 12,page 203 p (107-108)
• Aicha Kerdoune , Les mosquées historiques de la ville d’Alger
• Nabila OULEBSIR, Les usages du patrimoine
• Amable Ravoisié , l’Exploration scientifique de l’Algérie
• Albert Devoulx , El-Djazair , Histoire d’une cité d’icosium a Alger
• UNESCO-ihe.org
• Les archives du Bastion 23