Mezue ahịrịokwu na-esonụ: Kęstutis jiri ndị agha dị iche iche na ndị ọrụ diplomatic na mgba ya na mpaghara ọdịda anyanwụ nke Grand Duchy nke Lithuania. Na 1349, iji zere esemokwu ndị ọzọ na Teutonic Order, ọ malitere mkparịta ụka na Pope Clement VI maka Christianization nke Lithuania, na-enweta nkwa maka okpueze eze maka ya na ụmụ ya. Algirdas ji obi ya nile nọpụ iche n'azụmahịa ahụ ma na-eche banyere iwu na akụkụ Ruthenian nke steeti ahụ. Onye ogbugbo na mkparịta ụka ahụ, Eze Polish Casimir nke Atọ, mere mwakpo a na-atụghị anya ya na Volhynia na Brest n'October 1349 nke mebiri atụmatụ Kęstutis. N'oge
Agha Polish-Lithuanian maka Volhynia, Eze Louis nke Mbụ nke Hungary mere nkwekọrịta udo na Kęstutis na 15 Ọgọst 1351, nke Kęstutis nyere onwe ya iwu ịnabata Iso Christianityzọ Kraịst ma nye Alaeze Hungary enyemaka agha, na mgbanwe maka okpueze eze. Kęstutis kwadoro nkwekọrịta ahụ site na ememe ndị ọgọ mmụọ iji mee ka akụkụ nke ọzọ kwenye. N'ezie, Kęstutis enweghị ebumnuche ime ihe kwekọrọ na nkwekọrịta ahụ wee gbapụ n'ụzọ ha na Buda.