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Kassia, Cassia or Kassiani (Greek: , romanized: Kassianí, pronounced [kasia'ni]; 805/810 - before 865) was a Byzantine abbess, poet, composer, and hymnographer. She is one of the first medieval composers whose scores are both extant and able to be interpreted by modern scholars and musicians. Approximately fifty of her hymns are extant and twenty-three are included in Orthodox Church liturgical books. The exact number is difficult to assess, as many hymns are ascribed to different authors in different manuscripts and are often identified as anonymous.
Additionally, some 789 of her non-liturgical verses survive. Many are epigrams or aphorisms called "gnomic verse", for example, "I hate the rich man moaning as if he were poor."
Her name is a feminine Greek form of the Latin name Cassius. It is variously spelled (contemporary pronunciation [ka'sçani]), (?) (Kas[s]ia), ? (Eikasia), (Ikasia), Kassiani, Cas[s]ia, Cassiane, Kassiana. Modern English-language references to her as a composer generally use the name "Kassia," while references to her religious life tend to use Kassia or Kassiani.
Kassia was born between 805 and 810 in Constantinople into a wealthy family and grew to be exceptionally beautiful and intelligent. Three Byzantine chroniclers, Pseudo-Symeon the Logothete, George the Monk (a.k.a. George the Sinner) and Leo the Grammarian, claim that she was a participant in the "bride show" (the means by which Byzantine princes/emperors sometimes chose a bride, by giving a golden apple to his choice) organized for the young bachelor Theophilos by his stepmother, the Empress Dowager Euphrosyne. Smitten by Kassia's beauty, the young emperor approached her and said: "Through a woman [came forth] the baser [things]", referring to the sin and suffering coming as a result of Eve's transgression. Kassia promptly responded by saying: "And through a woman [came forth] the better [things]", referring to the hope of salvation resulting from the Incarnation of Christ through the Virgin Mary. According to tradition, the verbatim dialogue was:
His pride wounded by Kassia's terse rebuttal, Theophilos rejected her and chose Theodora as his wife.
When next we hear of Kassia in 843 she had founded a convent in the west of Constantinople, near the Constantinian Walls, and became its first abbess. Although many scholars[weasel words] attribute this to bitterness at having failed to marry Theophilos and to become Empress, a letter from Theodore the Studite indicates that she had other motivations for wanting a monastic life. It had a close relationship with the nearby monastery of Stoudios, which was to play a central role in re-editing the Byzantine liturgical books in the 9th and 10th centuries, thus ensuring the survival of her work (Kurt Sherry, p. 56). However, since the monastic life was a common vocation in her day, religious zeal is as likely a motive as either depression or aspiration for artistic renown.
The Emperor Theophilos was a fierce iconoclast, and any residual feelings he may have had for Kassia did not preserve her from the imperial policy of persecution for her defence of the veneration of icons. Among other things, she was subjected to scourging with a lash. In spite of this, she remained outspoken in defence of the Orthodox Faith, at one point saying, "I hate silence when it is time to speak."
After the death of Theophilos in 842 his young son Michael III became Eastern Roman Emperor, with Empress Theodora acting as Regent. Together they ended the second iconoclastic period (814-842); peace was restored to the empire.
Kassia traveled to Italy briefly, but eventually settled on the Greek Island of Kasos where she died sometime between 867 and 890 CE. In the city of Panaghia, there is a church where Kassia's tomb/reliquary may be found 
Kassiani wrote many hymns which are still used in the Byzantine liturgy to this day. Kassiani became known to the great Theodore the Studite, while she was still a young girl, and he was impressed by her learning and literary style. She not only wrote spiritual poetry, but composed music to accompany it. She is regarded as an "exceptional and rare phenomenon" among composers of her day At least twenty-three genuine hymns are ascribed to her.
The most famous of her compositions is the eponymous Hymn of Kassia (also known as the Troparion of Kassiani), which is chanted each year at matins on Holy Wednesday (which in usual parish practice is sung Tuesday evening) at the end of the aposticha.
Tradition says that in his later years the Emperor Theophilus, still in love with her, wished to see her one more time before he died, so he rode to the monastery where she resided. Kassia was alone in her cell, writing her Hymn when she realized that the commotion she heard was because the imperial retinue had arrived. She was still in love with him but was now devoted to God and hid away because she did not want to let her old passion overcome her monastic vow. She left the unfinished hymn on the table. Theophilus found her cell and entered it alone. He looked for her but she was not there; she was hiding in a closet, watching him. Theophilus, overcome with sadness, cried and regretted that moment of pride when he rejected such a beautiful and intellectual woman; then he noticed the papers on the table and read them. When he had finished reading, he sat and added one line to the hymn; then he left. The line attributed to the Emperor is the line "those feet whose sound Eve heard at dusk in Paradise and hid herself for fear". Legend says that as he was leaving he noticed Kassia in the closet but did not speak to her, out of respect for her wished privacy. Kassia emerged when the emperor was gone, read what he had written and finished the hymn.
The music for the hymn is slow, sorrowful and plaintive, lasting about ten to twenty minutes, depending on tempo and style of execution. It requires a very wide vocal range, and is considered one of the most demanding pieces -- if not the most demanding one -- of solo Byzantine chant, and cantors take great pride in delivering it well. It is also sung by choirs in unison, often underpinned by Byzantine vocal bass drone. The faithful make a point of going to church specifically "to listen to Kassiani" that evening. In many places in Greece, the Bridegroom Matins service of Great Tuesday is popular with sex workers, who may not often be seen in church at other times of the year. They come in great numbers, in order to hear the Hymn of Kassiani, as the hymn is associated with the woman fallen in many sins.
Many fictitious stories were created around her relationship with Emperor Theofilos. Contemporary historians such as Glykas, Ptochoprodromos, Kodinos, Zonaras and Georgios Amartolos described her exile in Italy during the Iconoclasy wars and later settled and died in Kasos sometime between 867 and 890 CE.
Among the other hymns she composed are the following:
The following are commercial recordings of the music of Kassia: