Agnes of Landsberg
Agnes of Landsberg( 1192 or 1193 – 1266 in Wienhausen) was a German noblewoman.
She was the third child of Conrad II( 1159 – 1210), Margrave of Lusatia, and his wife, Elisabeth( – 1209), the daughter of Mieszko III the Old( 1126 – 1202), Duke of Poland.
She was a daughter- in- law of Henry the Lion.
Wierzchoslawa Ludmilla of Greater Poland
Wierzchoslawa Ludmilla of Greater Poland( b. bef. 1153 – d. bef. 1223), was a Polish princess member of the House of Piast, by marriage Lady of Bitsch and during 1205- 1206 Duchess of Lorraine.
She was the second daughter and fourth child of Mieszko III the Old, Duke of Greater Poland and since 1173 High Duke of Poland, by his first wife Elisabeth, daughter of King Béla II of Hungary.
Her name was probably given after High Duchess Viacheslava of Novgorod, wife of Bolesław IV the Curly, the ruling High Duke of Poland; with this gesture, Duke Mieszko III maybe showed an expression of warming relations between him and his brother the High Duke.
Stephen of Greater Poland
Stephen of Greater Poland( 1150 – 18 October 1166/ 77?), was a Polish prince member of the House of Piast.
He was the second son of Mieszko III the Old, Duke of Greater Poland and since 1173 High Duke of Poland, by his first wife Elisabeth, daughter of King Béla II of Hungary.
His name was probably given by his mother.
Bolesław III Wrymouth
Bolesław III Wrymouth (also known as Boleslaus III the Wry-mouthed) (20 August 1086 – 28 October 1138), was a Duke of Lesser Poland, Silesia and Sandomierz between 1102 and 1107 and over the whole Poland between 1107 and 1138.
He was the only child of Prince Władysław
I Herman and his first wife Judith, daughter of Vratislaus II of Bohemia.
Bolesław began to rule in the last decade of the 11th century, when the central government in Poland was significantly weakened.
Władysław I Herman fell under the political dependence of the Count palatine Sieciech, who became the real ruler of the country.
Backed by their father, Boleslaw and his half-brother Zbigniew finally expelled Sieciech from the country in 1101, after several years of fighting.
After the death of Władysław
I Herman in 1102, two independent states were created ruled by Bolesław and Zbigniew.
Bolesław sought to gain Pomerania which caused an armed conflict between the brothers, and forced Zbigniew to flee the country and seek military help from German King Henry V. Bolesław punished Zbigniew by blinding him.
This action caused outrage among supporters of Zbigniew, resulting in a political crisis in Poland.
Bolesław once again gained the favor of his subjects with public penance, and made a pilgrimage to the monastery of his patron, Saint Giles, in Hungary.
Bolesław, like Bolesław II the Generous, based his foreign policy on maintaining good relations with neighboring Hungary and Kievan Rus, with whom he forged strong links through marriage and military cooperation in order to break the political dependence on Germany and his vassal, the King of Bohemia, who in moments of weakness of Polish policy was forced to pay tribute in Silesia.
These alliances have allowed Bolesław to effectively defend the country from invasion in 1109.
Several years later, Bolesław skillfully took advantage of the dynastic disputes in Bohemia to ensure peace on the south-west border.
Bolesław devoted the second half of his rule to the conquest of Pomerania.
In 1113 he conquered the northern strongholds along Noteć, which strengthened the border with the Pomeranians.
In subsequent years, he took steps toward the conquest of Pomerania.
The resolution of the conflict with the Holy Roman Empire allowed Bolesław to subordinate Western Pomerania and incorporate Gdańsk Pomerania.
The military expeditions, carried out in three stages, ended in the 1120s with military and political successes.
Integration of the newly annexed lands enabled Bolesław to build churches and began the process of converting Pomerania.
Bishop Otto of Bamberg confirmed the Christianization of Pomerania from 1123 onward.
In the 1130s Bolesław participated in the dynastic dispute in Hungary.
After an unexpected defeat, he was forced to make an agreement with Germany.
The Congress of Merseburg of 1135 addressed the issues of Pomerania, Silesian (probably also Polish) sovereignty and the supremacy of the Archbishopric of Magdeburg over the Polish Church.
Bolesław was married twice.
His first marriage with the Kievan princess
Zbyslava gave him an excuse to intervene militarily in the internal affairs of Russia.
After her death, Bolesław married to a German noblewoman, Salomea of Berg, which in some way was the cause of changes in Polish foreign policy: in the second half of his rule, the Prince sought to restore diplomatic relations with his western neighbor.
His last, and perhaps the most momentous act, was his will and testament known as "The Succession Statute" in which he divided the country among his sons, leading to almost 200 years of feudal fragmentation of the Polish Kingdom.
Bolesław III Wrymouth has been recognized by historiography as a symbol of Polish political aspirations until well into the 19th century.
He also upheld the independence of the Polish archbishopric of Gniezno, despite a temporary failure in the 1130s.
Despite undoubted successes, he committed serious political errors, most notably against Zbigniew of Poland, his half-brother.
The crime against Zbigniew and his penance for it show Bolesław's great ambition as well as his ability to find political compromise.
Mieszko III the Old
Mieszko III the Old
(c. 1126/27 – 13 March 1202), of the royal Piast dynasty, was Duke of Greater Poland from 1138 and High Duke of Poland, with interruptions, from 1173 until his death.
He was the fourth and second surviving son of Duke Bolesław III Wrymouth of Poland, by his second wife Salomea, daughter of the German count Henry of Berg-Schelklingen.
Bolesław of Kuyavia
Bolesław of Kuyavia( also known as Mieszkowic)( 1159 – 13 September 1195) was a Duke of Kuyavia from 1186 until his death.
He was the eldest child( but third- born son) of Mieszko III the Old, Duke of Greater Poland and High Duke of Poland in 1173, by his second wife Eudoxia, daughter of Grand Prince Iziaslav II of Kiev.
Euphemia of Greater Poland
Euphemia of Greater Poland( c. 1230 – 15 February after 1281), was a Polish princess member of the House of Piast from the Greater Poland branch and by marriage was Duchess of Kalisz, Wieluń and Opole- Racibórz.
Euphemia was the youngest child of Władysław Odonic and his wife Jadwiga, disputed daughter of Mestwin I, Duke of Pomerania and Swinisław, daughter of Mieszko III the Old.
Euphemia's date of birth is unknown.
In literature it claims Euphemia was born around 1230.
It is most likely she was born between( 1226 – 1230), fitting in with the dates of birth of her siblings and dates of death of her parents.
Odon of Poznań
Odon of Poznań, also known as Odon of Greater Poland and Mieszkowic,( – 20 April 1194) was a Duke of Greater Poland and Poznań during 1177 – 1182, and Duke of Kalisz from 1193 to 1194.
He was the oldest son of Mieszko III the Old, Duke of Greater Poland( and since 1173, High Duke of Poland) by his first wife, Elisabeth, who was the daughter of King Béla II of Hungary.
Mieszko the Younger
Mieszko the Younger( also known as of Kalisz)( between 1160 and 1165 – 2 August 1193) was a Duke of Kalisz since 1191 until his death.
He was the second child( but fourth- born son) of Mieszko III the Old, Duke of Greater Poland and since 1173 High Duke of Poland, by his second wife Eudoxia, daughter of Grand Prince Iziaslav II of Kiev.
Lucia of Rügen
Lucia of Rügen( died February 12 between 1208 and 1231), was the daughter of Jaromar I, Prince of Rügen and his wife Hildegard, daughter of Canute V of Denmark and Helena of Sweden.
In 1186, Lucia married Władysław III Spindleshanks, youngest son of Mieszko III the Old, Duke of Greater Poland and since 1173 High Duke of Poland.
This union was beneficial in Mieszko III's interests in Western Pomerania and Denmark.
The marriage was childless.
Lucia's character or appearance are unknown.
Certainly, her husband was n't faithful to her and had numerous mistresses.
The only known fact of Lucia's life during her time in Poland was when she was involved in the baptism of the youngest child of Henry I the Bearded and Hedwig of Andechs in Głogów on 25 December 1208.
Lucia stayed at the ceremony with her husband, perhaps brought the baby some presents.
Lucia's date of death is disputed among historians.
The Obituary of the Monastery of Lubin gives Lucia's date of death as 12 February, but not the year.
It is also unknown where she was buried.

Question: What is the date of birth of Mieszko Iii The Old's father?
Answer: 20 August 1086