One of the wives of विश्वकर्मा . The monkey named नल was the son of मन्दरा . This monkey was the chief of those who helped श्री राम to build a bridge to लङ्का . विश्वकर्मा had once blessed मन्दरा saying that her son would one day become great. (Sarga 22, Vālmīki Rāmāyaṇa) .