http://revach.net/article.php?id=4664

Section: Moadim   Category: Kinos
Kinos 21-23: Asara Harugei Malchus, Crusades, The Son & Daughter Of Rebbi Yishmael Kohen Gadol
21.  Arzei HaLevanon - This is a very brief account of the Asara HaRugei Malchus was written by Meir ben Yechiel.  Over the years a number of lines got lost and therefore only eight names are mentioned out of the ten.  A much more detailed account in found in Selichos of Mussaf of Yom Kippur.
 
Rav Shimshon Pincus explains that the reason for its inclusion in Kinos is that when these tzaddikim lived they brought so much good to the world that people did not long for the Bais HaMikdash.  There deaths are therefore directly tied to mourning for the Bais HaMikdash which needs to be done under all circumstances no matter how good things seem to be.
 
22.  Hacharishu Mimeni - This is a tribute to the Kehilos that were brutally massacred by the first crusade in 4856/1096 in Germany and France.  The Kina describes how the pure unwavering Yidden refused Baptism and happily chose death at the hands of the brutal mob.  The Kina also laments the great Gedolim that were killed and the blow to Torah scholarship and to the masses hungry to hear Torah that was silenced with the sword.
 
23.  V’Es Navi Chatasi describes the heartbreaking story of the son and daughter of Rebbi Yishmael Kohen Gadol.  The beauty and strength of the Bnei Yerushalayim is often discussed although we cannot fathom it.  So much more so for the children of the Kohen Gadol.  The two of them were captured and sold as slaves to two neighbors unbeknownst to each other. 
 
When the neighbors learn of the others slave they decide to throw them in a room together to produce more such slaves and split the children.  The Kinah described the anguish of each one them and how low they have fallen.  When they recognize each other at the light of dawn they embrace and their pure souls leave their bodies and ascend to Shamayim.