C[onver]timini ad me [in

Folio
Ar
Sequence
002
Text
C[onver]timini ad me [in toto corde] vestro in jejunio et fletu [et planctu] dicit do[minus] | Amen
Feast
Fer. 4 Cinerum
Genre
A
Position
*
Mode
1T?
Differentia
a = d
Differentiae database
T75dA
Cantus ID
001923
Notes

Only readable with great difficulty. No single word is legible in full, but search in Cantus Database of portions of words allowed for identification. For the same reasons, its liturgical occasion is hardly determinable. 

Eight out of the nine sources recording as of Sept. '22 the differentia used here are French, the other being from South England. 

Images
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Database Chant count
Cantus Database
https://cantusdatabase.org		 27
Spanish Early Music Manuscripts
https://musicahispanica.eu		 13
Cantus Planus in Polonia
https://cantusplanus.pl		 7
Slovak Early Music Database
https://cantus.sk		 3
Hungarian Chant Database
https://hun-chant.eu		 3
Portuguese Early Music Database
https://pemdatabase.eu		 2
Siglum Folio Seq Incipit Feast Office Genre Position Mode Image DB
A-Gu 29 098v 2 Convertimini ad me in toto Sabbato post Cineres N A 0 1 Image CD
A-Wn Cod. 1812 – Breviarium Strigoniense 121v 1 Convertimini ad me f4Cin 964 Ap 1 Image HCD
B-TOb olv 63 117v 7 Convertimini ad me in toto Ad Suffragium L A R 2 Image CD
B-TOb olv 64 102v 7 Convertimini ad me in toto Ad Suffragium L A R 2 Image CD
CZ-Pst DE I 7 104v 5 Convertimini ad me in toto Fer. 4 Cinerum X A 0 1 Image CD
CZ-Pst DE I 7 105r 7 Convertimini ad me* Fer. 4 Cinerum R A 0 1 Image CD
D-AAm G 20 065v 5 Convertimini ad me in toto Fer. 4 Cinerum L A R 1 Image CD
D-B Theol. Lat. Qu. 149 Breviarium monasticum 118v 4 Convertimini ad me in toto corde Fer. 4 Cinerum P A Image CPL
D-W 29 Helmst. 071r 5 Convertimini ad me in toto Fer. 4 Cinerum L A R 1 Image CD
E-Bbc (Barcelona) M 705 026r 5 Convertimini ad me in toto corde Fer. 4 Cinerum P A 1 Image SEMM
E-Bbc (Barcelona) Ms. 619 030r 11 Convertimini ad me in toto corde Fer. 4 Cinerum L A B 1 Image SEMM
E-Gs (Girona) ms. 45 128v 2 Convertimini ad me in toto corde Fer. 4 Cinerum E A 1 Image SEMM
E-H (Huesca) Ms. 2 0087v 1 Convertimini ad me in toto corde Fer. 3 Quinquages. V2 A M 1 Image SEMM
E-H (Huesca) Ms. 7 130r 3 Convertimini ad me in toto corde Fer. 4 Cinerum S A 1 Image SEMM
E-Tc 44.1 053r 3 Convertimini ad me in toto Fer. 4 Cinerum E A 1 ? Image CD
E-Tc 44.2 068v 2 Convertimini ad me in toto Fer. 4 Cinerum E A 2 1 Image CD
F-AI 44 078v 10 Convertimini ad eum in toto Fer. 3 Hebd. 1 Quad. X A 1 * Image CD
F-CA 38 080r 1 Convertimini ad me in toto Fer. 2 Hebd. 1 Quad. P A 0 2 Image CD
F-Pn Lat. 1085 044v 26 Convertimini ad me* Fer. 3 Quinquages. E A 1 1* Image CD
F-Pn Lat. 12044 071v 5 Convertimini ad me in toto Fer. 4 Cinerum E A 4 1 Image CD
GB-AB 20541 E 064v 13 Convertimini ad me in toto Suff. pro Penitent. L A R 2 Image CD
GB-Cu Mm.ii.9 149 1 Convertimini ad me in toto Suff. pro Penitent. L A R 2 Image CD
GB-Lbl (London) Add MS 30847 153r 1 Convertimini ad me in toto corde Fer. 4 Cinerum E A * Image SEMM
GB-Lbl (London) Add MS 30848 094v 12 Convertimini ad me in toto corde Fer. 4 Cinerum L A B 1 Image SEMM
GB-Lbl (London) Add MS 30848 094v 18 Convertimini* Fer. 4 Cinerum N A Image SEMM
GB-Lbl (London) Add MS 30848 095r 6 Convertimini* Fer. 5 post Cineres N A Image SEMM
GB-Lbl (London) Add MS 30849 092r 3 Convertimini ad me in toto corde Dom. 1 Quadragesimae V2 A M * Image SEMM
GB-Lbl (London) Add MS 30850 075v 4 Convertimini ad me in toto corde Fer. 4 Cinerum L A B 1 Image SEMM
GB-Lbl (London) Add MS 30850 075v 10 Convertimini Fer. 4 Cinerum N A 1 Image SEMM
GB-Lbl (London) Add MS 30850 075v 18 Convertimini Fer. 5 post Cineres N A 1 Image SEMM
GB-WO F.160 042r 4 Convertimini ad me in toto Fer. 4 Cinerum P A 0 1 Image CD
GB-WO F.160 (Facs) 084 4 Convertimini ad me in toto Fer. 4 Cinerum P A 0 1 Image CD
H-Efkö MS I. 3. c – Antiphonale Strigoniense I 005 5 Convertimini ad me f4Cin 964 Ap 5 Image HCD
I-MZ 15/79 058v 3 Convertimini ad me in toto Fer. 4 Cinerum E A 4 1 Image CD
I-PCd cod. 65 308r 8 Convertimini ad me in toto Fer. 4 Cinerum X A 1 2 Image CD
I-Rv C.5 110v 5 Convertimini ad me in toto Fer. 4 Cinerum L A B 2 Image CD
I-VCd CLXX 056r 1 Convertimini ad me in toto Fer. 2 Hebd. 1 Quad. P A 0 2 Image CD
NL-Uu 406 (3 J 7) 069r 4 Convertimini ad me in toto Fer. 4 Cinerum L A R 1 Image CD
P-Cug (Coimbra) Biblioteca Geral da Universidade MM 1063 (39) + MM 1063 (40) + MM 1063 (44) Dr Convertimini ad me* Quadrag., hebd. 3, fer. 2 R A 0 Image PEM
P-EVp (Évora) Biblioteca Pública Pasta 3, doc. 033 Ar C[onver]timini ad me [in Fer. 4 Cinerum A * 1T? Image PEM
PL-KIk 1 049v 11 Convertimini ad me in toto Fer. 4 Cinerum L A R 1 Image CD
PL-KIk 1 055r 2 Convertimini* Fer. 2 Hebd. 1 Quad. L A R 1 Image CD
PL-KIk 1 063r 9 Convertimini* Fer. 2 Hebd. 3 Quad. L A R 1 Image CD
PL-KIk 1 067r 7 Convertimini* Fer. 2 Hebd. 4 Quad. L A R 1 Image CD
PL-Klk 1 Antyfonarz kielecki 049v 11 Convertimini ad me in toto Fer. 4 Cinerum L A R 1 Image CPL
PL-Klk 1 Antyfonarz kielecki 055r 2 Convertimini* L A R 1 Image CPL
PL-Klk 1 Antyfonarz kielecki 063r 9 Convertimini* Fer. 2 Hebd. 3 Quad. L A R 1 Image CPL
PL-Klk 1 Antyfonarz kielecki 067r 7 Convertimini* Fer. 2 Hebd. 4 Quad. L A R 1 Image CPL
PL-PŁsem MsEPl 12 Antyfonarz z Płocka, pars de tempore 046v 6 Convertimini ad me in toto corde Fer. 4 Cinerum L A R 1 Image CPL
PL-STAb 2 Antiphonarium 039r 1 Convertimini ad me in toto corde Fer. 4 Cinerum P A 2 Image CPL
SK-BRsa (Bratislava) Slovenský národný archív - Antiphonary of Bratislava IIb 091r 4 Convertimini ad me in toto corde Fer. 4 Cinerum L A X Image CSK
SK-BRsa (Bratislava) Slovenský národný archív - Antiphonary of Bratislava IV 087r 11 Convertimini ad me in toto corde Fer. 4 Cinerum L A X Image CSK
SK-Bra (Bratislava) Antiphonary of Bratislava III EC Lad.6 053v 7 Convertimini ad me in toto corde Fer. 4 Cinerum L A X Image CSK
TR-Itks 42 058r 15 Convertimini ad me in toto Fer. 4 Cinerum X A 0 1 Image CD
TR-Itks 42 – Antiphonale Strigoniense 058r 21 Convertimini ad me f4Cin 964 Ap 21 Image HCD