The thes is deals with the manusc ripts in the coll ection of the Harro Sayl]s in Agarfa , Bale zone,rnOromia region. The co ll ection includes many printed books and also seven manuscripts. ThernI-Iarro Sayl]s have played many roles in Arsi-Bale, as teachers. reli gious leaders, public figu res,rnand mediators in contlict resolution.rnThe aim of this thesis is to present a handli st of the seven manuscripts in the Harro Sayl]s'rnco ll ection. !t has six chapters. The first chapter contains an introduction with literature review onrnthe history of Islam ization of Bale and in Ethiopia generall y. The second chapter gives thernbiographi es of the I-Iarro Sayl] s. The th ird chapter is a catalogue of the seven manuscri pts, withrnpa rti cul ar emphasis given to one untitled manuscript with numerous sub-titles (includingrnastronomy) and to the loose sheets, which include a text wi thout diacritics. The fourth chapter isrna discussion of selected themes having to do with women: l:!u! bat al-Nika:I (The MarriagernSermon) and documents from two non-Agarfa women who had a connection with the I-IarrornSayl]s, i.e. SittTna Alawiya (1892-1940) and 'Nisa Bint IA IT Sultan Gomma. The fitih chapter,rnwhich is the heart of the thes is, prese nts the astronomy tex t contained in the untitl ed manLiscript,rnwith Arabic tex t, tran slat ion and annotation. The last chapter contains conclusion andrnrecommendati on .rnThe !-Iano Sayl)s' collection was completely unstudied prior to this th es is, and is currentlyrnfo rgo tten even by the guardians of the collectio n. I hope that the stud y will be a bridge fo r furth errnstud ies of manusc ripts in the collection and a stim ulus to examine previously un studicd topics ofrnFt hi opian Arabic manuscripts such as astronomy.