Calbayog began as early as 1600 in a settlement called Hibatang by the river bank of the present Oquendo River. It had 2,000 inhabitants under the spiritual guidance of a certain Jesuit, Father Ignacio de Alzina. The present barangay Anislag was the forerunner of Calbayog settlement. The barangay is located along the river bank of Oquendo river, about ten kilometers north off the city proper. Historical remains of what was once a village church can be noticed by travelers passing this barangay.